0001130464-07-000206 11-K 2 20061231 20070628 20070628 BLACK HILLS CORP /SD/ 0001130464 4911 460458824 SD 1231 11-K 34 001-31303 07945814 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 11-K 1 form11k_401k.htm FORM 11-K CLFP 401K EX-23 2 ex23.htm INDEPENDENT ACCOUNTANT CONSENT