0001130464-08-000248 10-Q 3 20080630 20080811 20080811 BLACK HILLS CORP /SD/ 0001130464 4911 460458824 SD 1231 10-Q 34 001-31303 081006471 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_2ndqtr-2008.htm 2ND QTR 2008 10Q EX-31 2 ex31.htm CEO CERTIFICATION EX-32 3 ex32.htm CEO SECTION 1350 CERTIFICATION