0001130464-07-000082 10-K 10 20061231 20070301 20070301 BLACK HILLS CORP /SD/ 0001130464 4911 460458824 SD 1231 10-K 34 001-31303 07661821 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 10-K 1 form10k_2006.htm BHC FORM-K 2006 EX-10.18 2 exhibit_10-18.htm COMPENSATION AMENDMENT EX-21 3 exhibit_21.htm SUBSIDIARY LIST EX-23.1 4 exhibit_23-1.htm ACCOUNTING FIRM CONSENT EX-23.2 5 exhibit_23-2.htm PETROLEUM ENGINEER AND GEOLOGIST CONSENT EX-31.1 6 exhibit_31-1.htm CEO CERTIFICATION EX-31.2 7 exhibit_31-2.htm CFO CERTIFICATION EX-32.1 8 exhibit_32-1.htm CEO SECTION 1350 CERTIFICATION EX-32.2 9 exhibit_32-2.htm CFO SECTION 1350 CERTIFICATION 10-K 10 form10k_2006.pdf PDF FORMAT