9999999997-10-009528 ARS 1 20091231 20100414 20100422 20100414 BLACK HILLS CORP /SD/ 0001130464 4911 460458824 SD 0128 ARS 34 001-31303 10011561 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 ARS 1 9999999997-10-009528.paper AUTO-GENERATED PAPER DOCUMENT