0001130464-05-000405 8-K 2 20051123 8.01 9.01 20051125 20051125 BLACK HILLS CORP /SD/ 0001130464 4911 460458824 SD 1231 8-K 34 001-31303 051226802 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_northwestern.htm BHC NORTHWESTERN POSSIBLE MERGER EX-99.1 2 ex99_northwestern8k.htm PRESS RELEASE NORTHWESTERN