0001130464-07-000143 8-K 3 20070426 2.02 9.01 20070427 20070426 BLACK HILLS CORP /SD/ 0001130464 4911 460458824 SD 1231 8-K 34 001-31303 07792725 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_1stqtr-2007.htm FORM 8-K 1ST QTR 2007 GRAPHIC 2 ballot.jpg GRAPHIC EX-99 3 ex_99.htm 1ST QTR EARNINGS RELEASE