0001130464-05-000412 DEFA14A 1 20051125 20051125 20051125 BLACK HILLS CORP /SD/ 0001130464 4911 460458824 SD 1231 DEFA14A 34 001-31303 051226951 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 DEFA14A 1 rule14a12filing.htm SCHEDULE 14A12