0001130464-07-000322 4 1 20071130 20071204 20071204 BLACK HILLS CORP /SD/ 0001130464 4911 460458824 SD 1231 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 ROBINSON WARREN L 0001195507 4 34 001-31303 071284047 C/O MDU RESOURCES GROUP, INC. PO BOX 5650 BISMARK ND 58506-5650 4 1 edgardoc.xml PRIMARY DOCUMENT