0001130464-07-000244 8-K 6 20070828 8.01 9.01 20070829 20070829 BLACK HILLS CORP /SD/ 0001130464 4911 460458824 SD 1231 8-K 34 001-31303 071087612 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_aug292007.htm AQUILA ANTITRUST CLEARANCE GRAPHIC 2 ballot.jpg GRAPHIC EX-99 3 exhibit99.htm NEWS RELEASE GRAPHIC 4 img1.jpg GRAPHIC GRAPHIC 5 img2.jpg GRAPHIC GRAPHIC 6 img3.jpg GRAPHIC