0001130464-08-000217 8-K 3 20080711 8.01 9.01 20080711 20080711 BLACK HILLS CORP /SD/ 0001130464 4911 460458824 SD 1231 8-K 34 001-31303 08949428 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_ipp-close.htm IPP CLOSE GRAPHIC 2 ballot.jpg GRAPHIC EX-99 3 ex99.htm NEWS RELEASE