0001130464-07-000230 8-K 2 20070802 8.01 9.01 20070806 20070803 BLACK HILLS CORP /SD/ 0001130464 4911 460458824 SD 1231 8-K 34 001-31303 071025243 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 bhcform8k_080307.htm EX-99 2 ex99.htm