# Filing Detail

Form 10-K - Annual report [Section 13 and 15(d), not S-K Item 405]:
SEC Accession No. 0000067716-11-000021
Filing Date
2011-02-23
Accepted
2011-02-23 09:47:25
Documents
18
Period of Report
2010-12-31

Document Format Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
1 | MDU RESOURCES GROUP, INC. FORM 10-K FOR PERIOD ENDED 12/31/2010 | mduform10-k2010.htm | 10-K | 5116724
2 | COMPANY BYLAWS | exhibit3b.htm | EX-3.B | 171511
3 | MDUR EXECUTIVE OFFICERS WITH CHANGE OF CONTROL EMPLOYMENT AGREEMENTS 12/31/10 | exhibit10n.htm | EX-10.N | 17224
4 | INSTRUMENT OF AMENDMENT TO MDUR 401(K) RETIREMENT PLAN 12/29/10 | exhibit10ae.htm | EX-10.AE | 22579
5 | COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES AND COMBINED FIXED CHARGES AND | exhibit12.htm | EX-12 | 105799
6 | SUBSIDIARIES OF MDU RESOURCES GROUP, INC. | exhibit21.htm | EX-21 | 55070
7 | CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM | exhibit23a.htm | EX-23.A | 4021
8 | CONSENT OF RYDER SCOTT COMPANY, L.P. | exhibit23b.htm | EX-23.B | 4956
9 | CERTIFICATION OF CEO - SEC 302 SOX ACT 2002 | exhibit31a.htm | EX-31.A | 12150
10 | CERTIFICATION OF CFO - SEC 302 SOX ACT 2002 | exhibit31b.htm | EX-31.B | 13568
11 | CERTIFICATION OF CEO AND CFO - 18 USC SEC 1350 - SEC 906 SOX ACT 2002 | exhibit32.htm | EX-32 | 7723
12 | RYDER SCOTT COMPANY, L.P. REPORT DATED 1/13/11 | exhibit99b.htm | EX-99.B | 161808
| Complete submission text file | 0000067716-11-000021.txt |  | 15263727

Data Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
13 | INSTANCE DOCUMENT | mdu-20101231.xml | EX-101.INS | 2557976
14 | SCHEMA DOCUMENT | mdu-20101231.xsd | EX-101.SCH | 20837
15 | CALCULATION LINKBASE DOCUMENT | mdu-20101231_cal.xml | EX-101.CAL | 61956
16 | LABEL LINKBASE DOCUMENT | mdu-20101231_lab.xml | EX-101.LAB | 241626
17 | PRESENTATION LINKBASE DOCUMENT | mdu-20101231_pre.xml | EX-101.PRE | 135451
18 | DEFINITION LINKBASE DOCUMENT | mdu-20101231_def.xml | EX-101.DEF | 15337

Mailing Address 1200 WEST CENTURY AVENUE BISMARCK ND 58503
Business Address 1200 WEST CENTURY AVENUE BISMARCK ND 58503 701-530-1059
MDU RESOURCES GROUP INC (Filer) CIK: 0000067716 (see all company filings)

EIN.: 410423660 | State of Incorp.: DE | Fiscal Year End: 1231
Type: 10-K | Act: 34 | File No.: 001-03480 | Film No.: 11630726
SIC: 1400 Mining & Quarrying of Nonmetallic Minerals (No Fuels)