Holden Engineering, Casper, WY No description specified. 1-2 (2 Records) Documents Letter Report: Archaeological Survey for Well Pad, Access, and Surrounding 40 Acre Area, 44-19 Neva Federal Well Pad (1979) Letter Report: Well Pad and Access Survey for Holden Engineering For Cominco American #1, Greybull Prospect, Big Horn County, Wyoming (1980)