<SEC-DOCUMENT>0000067716-11-000079.txt : 20111117
<SEC-HEADER>0000067716-11-000079.hdr.sgml : 20111117
<ACCEPTANCE-DATETIME>20110929150021
<PRIVATE-TO-PUBLIC>
ACCESSION NUMBER:		0000067716-11-000079
CONFORMED SUBMISSION TYPE:	CORRESP
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20110929

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MDU RESOURCES GROUP INC
		CENTRAL INDEX KEY:			0000067716
		STANDARD INDUSTRIAL CLASSIFICATION:	MINING, QUARRYING OF NONMETALLIC MINERALS (NO FUELS) [1400]
		IRS NUMBER:				410423660
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		CORRESP

	BUSINESS ADDRESS:	
		STREET 1:		1200 WEST CENTURY AVENUE
		CITY:			BISMARCK
		STATE:			ND
		ZIP:			58503
		BUSINESS PHONE:		701-530-1059

	MAIL ADDRESS:	
		STREET 1:		1200 WEST CENTURY AVENUE
		CITY:			BISMARCK
		STATE:			ND
		ZIP:			58503

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MONTANA DAKOTA UTILITIES CO
		DATE OF NAME CHANGE:	19850429
</SEC-HEADER>
<DOCUMENT>
<TYPE>CORRESP
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">MDU RESOURCES GROUP, INC.</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">1200 West Century Avenue</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Bismarck, ND&#160;&#160;58503</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Bismarck, ND&#160; 58506-5650</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">(701) 530-1000</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">September 29, 2011</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Ms. Anne Parker, Branch Chief</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">United States Securities and Exchange Commission</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">100 F Street NE</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">Form 10-K for Fiscal Year Ended December 31, 2010</font></div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">File No. 1-3480</font></div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Dear Ms. Parker:</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">On behalf of MDU Resources Group, Inc. (MDU or the Company), we hereby submit MDU's responses to the comments of the staff (the Staff) of the Securities and Exchange Commission (the Commission) set forth in the Staff's letter, dated August 31, 2011, with respect to the above referenced periodic report filed under the Securities Exchange Act of 1934.</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">For the convenience of the Staff, each of the Staff's comments is included and is followed by the corresponding response of MDU. References in this letter to "we," "us" and "our" refer to MDU unless the context indicates otherwise.</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">We believe that our Annual Report on Form 10-K for the year ended December&#160;31, 2010 (2010&#160;Form 10-K) provides investors with full and transparent disclosure sufficient to give an understanding of our business. We propose to incorporate your comments, as applicable, on a prospective basis in our Annual Report on Form 10-K for the year ended December&#160;31, 2011 (2011 Form 10-K).</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">MDU RESOURCES GROUP, INC.</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Ms. Anne Parker</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">As requested in your letter, we acknowledge that:</font></div>

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<div style="TEXT-INDENT: 0pt; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">The Company is responsible for the adequacy and accuracy of the disclosure in the filing;</font></div>
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<div style="TEXT-INDENT: 0pt; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Staff comments or changes to disclosure in response to Staff comments do not foreclose the Commission from taking any action with respect to the filing; and</font></div>
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<div style="TEXT-INDENT: 0pt; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">The Company may not assert Staff comments as a defense in any proceeding initiated by the Commission or any person under the federal securities laws of the United States.</font></div>
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<div style="TEXT-INDENT: 0pt; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">We note that you have provided your developed and undeveloped oil and gas acreage as of December&#160;31, 2010. However, it does not appear that you have disclosed information regarding the related minimum remaining terms of leases and concessions. Please expand your disclosure to comply the guidance in Item&#160;1208(b) of Regulation&#160;S-K.</font></div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt"><font style="DISPLAY: inline; FONT-WEIGHT: bold; TEXT-DECORATION: underline">MDU Response</font><font style="DISPLAY: inline; FONT-WEIGHT: bold">:&#160;&#160;</font>We propose to disclose in our future Annual Reports on Form&#160;10-K the information regarding minimum remaining terms of leases and concessions on our undeveloped acreage. We propose the following disclosure, with information as of December 31, 2010 as an illustration, which would immediately follow the existing table of developed and undeveloped acreage:</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Fidelity's interest in undeveloped acreage as of December&#160;31, 2010, that is subject to expiration in 2011, 2012, 2013, and thereafter is as follows:</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">In most cases, acreage set to expire can be held through drilling operations or the Company can exercise extension options.</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Ms. Anne Parker</font></div>

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<div style="TEXT-INDENT: 0pt; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Please disclose whether you have any delivery commitments that must be fulfilled for your oil and gas production. Please see Item&#160;1207 of Regulation&#160;S-K.</font></div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt"><font style="DISPLAY: inline; FONT-WEIGHT: bold; TEXT-DECORATION: underline">MDU Response</font><font style="DISPLAY: inline; FONT-WEIGHT: bold">:&#160;&#160;</font>Our natural gas and oil production segment did not have any material contractual agreements to deliver a fixed and determinable amount of natural gas or oil at December 31, 2010. However, Prairielands Energy Marketing, Inc. (Prairielands), a wholly owned subsidiary of WBI Holdings, which is part of the pipeline and energy services segment, markets the majority of the Company's natural gas production in the Rocky Mountain region and Prairielands has delivery commitments to deliver fixed and determinable amounts of natural gas under contracts it has entered into. In regard to the delivery commitments entered into by Prairielands, we have disclosed in our 2010 Form&#160;10-K that we have entered into such contracts in Items&#160;1 and 2 &#8211; Business and Properties &#8211; Pipeline and Energy Services &#8211; General, third paragraph. However, we propose disclosing the volumetric amount of these commitments as well on a prospective basis beginning in our 2011 Form&#160;10-K. The proposed change to the disclosure would read as follows (new information has been underlined):</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">WBI Holdings, through its energy services business, provides natural gas purchase and sales services to local distribution companies, producers, other marketers and a limited number of large end-users, primarily using natural gas produced by the Company's natural gas and oil production segment. Certain of the services are provided based on contracts that call for a determinable quantity of natural gas. <font style="DISPLAY: inline; TEXT-DECORATION: underline">At December&#160;31, 2010, the Company has commitments to deliver fixed and determinable amounts of natural gas under these contracts of 16.2 Bcf in 2011 and the commitments to deliver natural gas for years subsequent to 2011 are immaterial.</font> WBI Holdings currently estimates that it can adequately meet the requirements of these contracts <font style="DISPLAY: inline; TEXT-DECORATION: underline">based upon its estimated natural gas production and reserves</font>. WBI Holdings transacts a majority of its pipeline and energy services business in the northern Great Plains and Rocky Mountain regions of the United States.</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">In addition, we propose to clarify that our natural gas and oil production segment does not have any material delivery commitments to deliver fixed and determinable amounts of natural gas or oil by adding disclosure on a prospective basis beginning in our 2011 Form&#160;10-K under Items&#160;1 and 2 &#8211; Business and Properties &#8211; Natural Gas and Oil Production &#8211; General. The proposed disclosure would read as follows:</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Ms. Anne Parker</font></div>

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<div align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt"><font style="DISPLAY: inline; FONT-WEIGHT: bold; TEXT-DECORATION: underline">MDU Response</font><font style="DISPLAY: inline; FONT-WEIGHT: bold">:&#160;&#160;</font>We currently have six business segments consisting of both regulated and nonregulated operations that operate in various lines of business. In addition, costs not subject to amortization represent less than 5 percent and 3 percent of net property, plant and equipment and total assets, respectively, at December&#160;31, 2010 and 2009. Due to the diversification of the Company and the immateriality of the costs not subject to amortization, the Company has historically presented information on its costs not subject to amortization in Note&#160;1 under "Property, plant and equipment" and "Natural gas and oil properties" as well as in Supplementary Financial Information - Natural Gas and Oil Activities. Based on the above, we propose continuing our current presentation of costs not subject to amortization in future filings.</font></div>
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<div style="TEXT-INDENT: 0pt; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Please tell us whether there is any item included in your other liabilities that is in excess of five percent of your total liabilities. Refer to Rule&#160;5-02.24 of Regulation&#160;S-X.</font></div>
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<div align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt"><font style="DISPLAY: inline; FONT-WEIGHT: bold; TEXT-DECORATION: underline">MDU Response</font><font style="DISPLAY: inline; FONT-WEIGHT: bold">:&#160;&#160;</font>The only item included in other liabilities that is in excess of five percent of our total liabilities is plant removal and decommissioning costs of $276.7&#160;million and $251.1&#160;million at December&#160;31, 2010 and 2009, respectively. Rule&#160;5-02.24 of Regulation&#160;S-X indicates that any item in excess of five percent of total liabilities not properly classified in one of the preceding liability captions shall be stated separately, in the balance sheet, or in a note thereto. We have stated the amounts of the plant removal and decommissioning costs in Note&#160;6 - Regulatory Assets and Liabilities along with a footnote indicating that these amounts are included in other liabilities on</font></div>
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<div align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt"><font style="DISPLAY: inline; FONT-WEIGHT: bold; TEXT-DECORATION: underline">MDU Response</font><font style="DISPLAY: inline; FONT-WEIGHT: bold">:&#160;&#160;</font>We evaluate the components of "other" deferred tax assets and liabilities recognized as of December&#160;31 of each year to determine whether additional amounts should be presented in further detail in the Notes to Consolidated Financial Statements.</font></div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">There were no individual "other" deferred tax assets at December&#160;31, 2010 and 2009, in excess of 5 percent and 3 percent of total deferred tax assets, respectively, and we determined that there were no individually significant items that would be required to be presented in further detail. However, as requested, at December&#160;31, 2010, the major components of "other" deferred tax assets consisted of legal and environmental contingency accruals of $13.6&#160;million, worker's compensation accruals of $5.5&#160;million, capitalized inventory overhead of $5.1&#160;million, allowance for bad debts of $4.8&#160;million and customer advances for construction of $4.5&#160;million. As of December&#160;31, 2009, the major components of "other" deferred tax assets consisted of worker's compensation accruals of $6.5&#160;million, purchased state tax credits of $6.3&#160;million, capitalized inventory overhead of $5.7&#160;million and allowance for bad debts of $5.2&#160;million. The remainder of the balances consisted of numerous insignificant items.</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">In addition, our total "other" deferred tax liabilities at December&#160;31, 2010 and 2009, were less than 3&#160;percent and 4&#160;percent, respectively, of total deferred tax liabilities, and we determined that there were no individually significant items that would be required to be presented in further detail. However, as requested, at December&#160;31, 2010 and 2009, the major component of "other" deferred tax liabilities consisted of deferred tax liabilities related to our international operations of $3.2&#160;million and $10.5&#160;million, respectively.</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Ms. Anne Parker</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">United States Securities and Exchange Commission</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">September 29, 2011</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Page 6</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">We plan to continue to evaluate the components of "other" deferred tax assets and liabilities recognized as of December&#160;31 of each year to determine whether additional amounts should be presented in further detail in the Notes to Consolidated Financial Statements. We plan to include a description of any deferred tax asset or liability that is in excess of 5 percent of total deferred tax assets and deferred tax liabilities, respectively.</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt"><font style="DISPLAY: inline; TEXT-DECORATION: underline">Natural Gas and Oil Activities</font></font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt"><font style="DISPLAY: inline; TEXT-DECORATION: underline">Estimated Quantities of Proved Natural Gas and Oil Reserves, page 135</font></font></div>

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<table cellpadding="0" cellspacing="0" id="list" width="100%" style="FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">
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<div><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">6.&#160;&#160;</font></div>
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<div style="TEXT-INDENT: 0pt; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">With regard to your proved developed and undeveloped reserves, we note that you recorded downward revisions of previous estimates of 55,477&#160;MMcfe during 2010 and 122,135&#160;MMcfe during 2009. Please provide us with additional information regarding these revisions with a focus on the underlying performance and economic causal factors. Refer to FASB ASC 932-235-50-5.</font></div>
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<table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">
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<div><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">&#160; </font></div>
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<td>&#160;</td>
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<div>
<table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">
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<div><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">&#160; </font></div>
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<div align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt"><font style="DISPLAY: inline; FONT-WEIGHT: bold; TEXT-DECORATION: underline">MDU Response</font><font style="DISPLAY: inline; FONT-WEIGHT: bold">:&#160;&#160;</font>Following is additional information surrounding the Company's revision of previous estimates of proved reserves:</font></div>
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<table cellpadding="0" cellspacing="0" width="90%" style="FONT-FAMILY: times new roman; FONT-SIZE: 10pt; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">
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<td valign="bottom" width="52%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160; </font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="10" valign="bottom" width="34%">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Year ended December&#160;31, 2010</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="2%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
</tr><tr>
<td valign="bottom" width="52%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160; </font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Natural Gas</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Oil</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Total</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="2%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
</tr><tr>
<td valign="bottom" width="52%" style="PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160; </font></td>
<td valign="bottom" width="1%" style="PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%" style="BORDER-BOTTOM: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(MMcf)</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%" style="BORDER-BOTTOM: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(MBbls)</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%" style="BORDER-BOTTOM: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(MMcfe)</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="2%" style="PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%" style="PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left; PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
</tr><tr>
<td align="left" valign="bottom" width="52%">
<div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Revision of previous estimates detail:</font></div>
</td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="2%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
</tr><tr bgcolor="#cceeff">
<td align="left" valign="bottom" width="52%">
<div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 27pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Impact relating to change in economic factors</font></div>
</td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">41,241</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">1,396</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">49,615</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td align="left" valign="bottom" width="2%">&#160;</td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">[A]</font></td>
<td valign="bottom" width="10%" style="TEXT-ALIGN: right">&#160;</td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left">&#160;</td>
</tr><tr bgcolor="white">
<td align="left" valign="bottom" width="52%">
<div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 27pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Removal of PUD's due to SEC 5-year rule</font></div>
</td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(7,793</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(1,304</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(15,615</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td valign="bottom" width="2%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="10%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
</tr><tr bgcolor="#cceeff">
<td align="left" valign="bottom" width="52%" style="PADDING-BOTTOM: 2px">
<div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 27pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Impact relating to performance adjustments</font></div>
</td>
<td align="left" valign="bottom" width="1%" style="PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(74,303</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(2,529</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(89,477</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="2%" style="PADDING-BOTTOM: 2px">&#160;</td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left; PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">[B]</font></td>
<td valign="bottom" width="10%" style="TEXT-ALIGN: right; PADDING-BOTTOM: 2px">&#160;</td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left; PADDING-BOTTOM: 2px">&#160;</td>
</tr><tr bgcolor="white">
<td align="left" valign="bottom" width="52%" style="PADDING-BOTTOM: 4px">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Total</font></div>
</td>
<td align="left" valign="bottom" width="1%" style="PADDING-BOTTOM: 4px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(40,855</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(2,437</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(55,477</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td valign="bottom" width="2%" style="PADDING-BOTTOM: 4px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left; PADDING-BOTTOM: 4px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="10%" style="TEXT-ALIGN: right; PADDING-BOTTOM: 4px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left; PADDING-BOTTOM: 4px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
</tr><tr bgcolor="white">
<td valign="bottom" width="52%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160; </font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="2%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="10%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
</tr></table>
</div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block"><br>
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<div id="PGBRK" style="TEXT-INDENT: 0pt; WIDTH: 100%; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt">
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<div style="TEXT-ALIGN: center; WIDTH: 100%"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 8pt">&#160; </font></div>

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<div style="WIDTH: 100%" align="left">
<div style="TEXT-INDENT: 0pt; DISPLAY: block"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">MDU RESOURCES GROUP, INC.</font></div>

<br>
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Ms. Anne Parker</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">United States Securities and Exchange Commission</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">September 29, 2011</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Page 7</font></div>

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<div align="center">
<table cellpadding="0" cellspacing="0" width="90%" style="FONT-FAMILY: times new roman; FONT-SIZE: 10pt; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">
<tr>
<td valign="bottom" width="52%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160; </font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="10" valign="bottom" width="34%">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Year ended December&#160;31, 2009</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
</tr><tr>
<td valign="bottom" width="52%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160; </font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Natural Gas</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Oil</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Total</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
</tr><tr>
<td valign="bottom" width="52%" style="PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160; </font></td>
<td valign="bottom" width="1%" style="PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%" style="BORDER-BOTTOM: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(MMcf)</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%" style="BORDER-BOTTOM: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(MBbls)</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%" style="BORDER-BOTTOM: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(MMcfe)</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%" style="PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left; PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
</tr><tr>
<td align="left" valign="bottom" width="52%">
<div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Revision of previous estimates detail:</font></div>
</td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
</tr><tr bgcolor="#cceeff">
<td align="left" valign="bottom" width="52%">
<div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 27pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Impact relating to change in economic factors</font></div>
</td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(102,181</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">692</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(98,025</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%">&#160;</td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">[A]</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right">&#160;</td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left">&#160;</td>
</tr><tr bgcolor="white">
<td align="left" valign="bottom" width="52%" style="PADDING-BOTTOM: 2px">
<div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 27pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Impact relating to performance adjustments</font></div>
</td>
<td align="left" valign="bottom" width="1%" style="PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(23,904</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(34</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(24,110</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%" style="PADDING-BOTTOM: 2px">&#160;</td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left; PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">[B]&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right; PADDING-BOTTOM: 2px">&#160;</td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left; PADDING-BOTTOM: 2px">&#160;</td>
</tr><tr bgcolor="#cceeff">
<td align="left" valign="bottom" width="52%" style="PADDING-BOTTOM: 4px">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Total</font></div>
</td>
<td align="left" valign="bottom" width="1%" style="PADDING-BOTTOM: 4px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(126,085</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">658</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td align="left" valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(122,135</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td valign="bottom" width="1%" style="PADDING-BOTTOM: 4px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left; PADDING-BOTTOM: 4px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right; PADDING-BOTTOM: 4px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left; PADDING-BOTTOM: 4px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
</tr></table>
</div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block"><br>
</div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">[A] The impact relating to the change in economic factors was primarily related to underlying benchmark price changes from period to period.</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block"><br>
</div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">In 2010, there was a 13%, 15%, and 30% increase in benchmark Henry Hub, Ventura, and CIG natural gas prices, respectively, contributing to positive revisions. And, there was a 30% increase in benchmark NYMEX oil prices, contributing to positive revisions.</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block"><br>
</div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">In 2009, there was a 32%, 35%, and 34% decrease in benchmark Henry Hub, Ventura, and CIG natural gas prices, respectively, contributing to the negative revisions. And, there was a 37% increase in benchmark NYMEX oil prices, contributing to positive revisions.</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block"><br>
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<br>
<div id="PGBRK" style="TEXT-INDENT: 0pt; WIDTH: 100%; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt">
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<div id="PN" style="PAGE-BREAK-AFTER: always; WIDTH: 100%">
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<div style="WIDTH: 100%" align="left">
<div style="TEXT-INDENT: 0pt; DISPLAY: block"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">MDU RESOURCES GROUP, INC.</font></div>

<br>
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Ms. Anne Parker</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">United States Securities and Exchange Commission</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">September 29, 2011</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Page 8</font></div>

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<br>
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">[B] The geographic areas that comprise the change relating to performance adjustments are quantified, along with further explanation of the reasons for the changes, and are detailed below:</font></div>

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<div align="center">
<table cellpadding="0" cellspacing="0" width="90%" style="FONT-FAMILY: times new roman; FONT-SIZE: 10pt; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">
<tr>
<td valign="bottom" width="64%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160; </font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="10" valign="bottom" width="34%">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Year ended December&#160;31, 2010</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
</tr><tr>
<td valign="bottom" width="64%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160; </font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Natural Gas</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Oil</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Total</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
</tr><tr>
<td valign="bottom" width="64%" style="PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160; </font></td>
<td valign="bottom" width="1%" style="PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%" style="BORDER-BOTTOM: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(MMcf)</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%" style="BORDER-BOTTOM: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(MBbls)</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%" style="BORDER-BOTTOM: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(MMcfe)</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
</tr><tr bgcolor="#cceeff">
<td align="left" valign="bottom" width="64%">
<div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">South Texas &#8211; Frio Vicksburg gas with NGL's</font></div>
</td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(22,402</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(1,810</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(33,262</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
</tr><tr bgcolor="white">
<td align="left" valign="bottom" width="64%">
<div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Bowdoin &#8211; Cretaceous shallow gas</font></div>
</td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(21,760</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#8212;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(21,760</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
</tr><tr bgcolor="#cceeff">
<td align="left" valign="bottom" width="64%">
<div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Baker &#8211; Cretaceous shallow gas</font></div>
</td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(16,108</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#8212;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(16,108</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
</tr><tr bgcolor="white">
<td align="left" valign="bottom" width="64%">
<div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">East Texas &#8211; Cotton Valley</font></div>
</td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(11,539</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(586</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(15,051</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
</tr><tr bgcolor="#cceeff">
<td align="left" valign="bottom" width="64%" style="PADDING-BOTTOM: 2px">
<div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Other Changes</font></div>
</td>
<td align="left" valign="bottom" width="1%" style="PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(2,494</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(133</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(3,296</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
</tr><tr bgcolor="white">
<td valign="bottom" width="64%" style="PADDING-BOTTOM: 4px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160; </font></td>
<td align="left" valign="bottom" width="1%" style="PADDING-BOTTOM: 4px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(74,303</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(2,529</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(89,477</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
</tr><tr bgcolor="white">
<td valign="bottom" width="64%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160; </font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
</tr><tr bgcolor="white">
<td valign="bottom" width="64%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160; </font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="10" valign="bottom" width="34%">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Year ended December&#160;31, 2009</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
</tr><tr bgcolor="white">
<td valign="bottom" width="64%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160; </font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Natural Gas</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Oil</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Total</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
</tr><tr bgcolor="white">
<td valign="bottom" width="64%" style="PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160; </font></td>
<td valign="bottom" width="1%" style="PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%" style="BORDER-BOTTOM: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(MMcf)</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%" style="BORDER-BOTTOM: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(MBbls)</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td colspan="2" valign="bottom" width="10%" style="BORDER-BOTTOM: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(MMcfe)</font></div>
</td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
</tr><tr bgcolor="#cceeff">
<td align="left" valign="bottom" width="64%">
<div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">East Texas &#8211; Cotton Valley</font></div>
</td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(10,104</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(57</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(10,444</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
</tr><tr bgcolor="white">
<td align="left" valign="bottom" width="64%">
<div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">South Texas &#8211; Frio Vicksburg gas with NGL's</font></div>
</td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(5,417</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(73</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(5,855</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
</tr><tr bgcolor="#cceeff">
<td align="left" valign="bottom" width="64%">
<div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Bowdoin &#8211; Cretaceous shallow gas</font></div>
</td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(5,135</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#8212;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(5,135</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
</tr><tr bgcolor="white">
<td align="left" valign="bottom" width="64%">
<div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Baker &#8211; Cretaceous shallow gas</font></div>
</td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(3,324</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#8212;</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td align="left" valign="bottom" width="1%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(3,324</font></td>
<td nowrap valign="bottom" width="1%" style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
</tr><tr bgcolor="#cceeff">
<td align="left" valign="bottom" width="64%" style="PADDING-BOTTOM: 2px">
<div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Other Changes</font></div>
</td>
<td align="left" valign="bottom" width="1%" style="PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">76</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td align="left" valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">96</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td align="left" valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">648</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
</tr><tr bgcolor="white">
<td valign="bottom" width="64%" style="PADDING-BOTTOM: 4px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160; </font></td>
<td align="left" valign="bottom" width="1%" style="PADDING-BOTTOM: 4px"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(23,904</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(34</font></td>
<td nowrap valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">)</font></td>
<td align="left" valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="1%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></td>
<td valign="bottom" width="9%" style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: right"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(24,110</font></td>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">The performance adjustments outlined in the specific geographic areas in the above tables occurred in existing conventional gas reservoirs. In all cases, these reserves are the result of drilling programs within existing producing natural gas fields. Reserve estimates are primarily based on historical production performance (extrapolation of rate versus time trends). Honoring the most recent historical production data necessitated using steeper decline rates resulting in lower proved developed reserve estimates. Proved undeveloped reserves were also adjusted lower to correspond with the analogous offset proved developed wells. In addition to performance-based estimates, new geologic data and geophysical data necessitated a revision of reserves in the</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Company's non-operated interests in South Texas. The new geological evidence coupled with volumetric calculations and pressure data indicated that certain stated volumes of proved reserves no longer met the reasonably certain criteria to remain in the proved reserve category.</font></div>

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<font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt"><font style="DISPLAY: inline; TEXT-DECORATION: underline">Change in the standardized measure of discounted future net cash flows, page 138</font></font></div>
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<div style="TEXT-INDENT: 0pt; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">We note you include "change in net realization" as a source of change in the standardized measure of discounted future cash flows. Please describe this source of change. Refer to FASB ASC 932-235-50-35.</font></div>
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<div align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt"><font style="DISPLAY: inline; FONT-WEIGHT: bold; TEXT-DECORATION: underline">MDU Response</font><font style="DISPLAY: inline; FONT-WEIGHT: bold">:&#160;&#160;</font>The "change in net realization" is the net change in sales prices and production costs related to future production. We propose to change the description of this line item in our sources of change in the standardized measure of discounted future net cash flows by year in our 2011 Form&#160;10-K from "Change in net realization" to "Net change in sales prices and production costs related to future production."</font></div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">If you would like to discuss any of the responses to the Staff's comments or if you would like to discuss any other matters, please contact me at (701) 530-1035.</font></div>

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