0001130464-09-000154 8-K 3 20090430 2.02 9.01 20090501 20090430 BLACK HILLS CORP /SD/ 0001130464 4911 460458824 SD 1231 8-K 34 001-31303 09785831 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_043009-1stqtrearnings.htm 1ST QUARTER EARNINGS GRAPHIC 2 ballot.jpg GRAPHIC EX-99 3 ex_99.htm PRESS RELEASE 1ST QTR 2009