0001130464-08-000167 10-Q 5 20080331 20080509 20080509 BLACK HILLS CORP /SD/ 0001130464 4911 460458824 SD 1231 10-Q 34 001-31303 08817847 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 10-Q 1 form10q_1stqtr-2008.htm 1ST QTR 10Q 2008 EX-10.3 2 ex_10-3.htm 4TH AMENDMENT TO ENSERCO CREDIT AGREEMENT EX-10.4 3 ex_10-4.htm 3RD AMENDMENT TO ENSERCO CREDIT AGREEMENT EX-31 4 ex_31.htm CEO CERTIFICATION EX-32 5 ex_32.htm CEO SECTION 1350 CERTIFICATION