0001130464-07-000171 8-K 4 20070511 1.01 2.03 9.01 20070516 20070516 BLACK HILLS CORP /SD/ 0001130464 4911 460458824 SD 1231 8-K 34 001-31303 07856962 625 9TH STREET PO BOX 1400 RAPID CITY SD 57709 6057212343 625 9TH STREET PO BOX 1400 RAPID SD 57709 BLACK HILLS HOLDING CORP 20001222 8-K 1 form8k_ensercocredit-may07.htm FORM 8-K ENSERCO CREDIT FACILITY MAY 2007 GRAPHIC 2 ballot.jpg GRAPHIC EX-10.1 3 ex10-1.htm SECOND AMEND TO SECOND AMENDED CREDIT AGR EX-10.2 4 ex10-2.htm FIRST AMEND TO SECOND AMENDED CREDIT AGR