0001130464-09-000295 4 1 20091130 20091202 20091202 Vering John B 0001328537 4 34 001-31303 091217717 PO BOX 1400 RAPID CITY SD 57709 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 4 1 primary_doc.xml PRIMARY DOCUMENT