Petroleum Engineers Inc., Denver, Co No description specified. 1-2 (2 Records) Documents Letter Report: Archaeological Survey for Petroleum Engineers, Inc., #2 Federal Ormsby Well Pad and Access, 40 Acres (1979) Letter Report: Archaeological Survey of Well Pad, Access To Well Pad, and Area Surrounding Well Pad Totalling 40 Acres for Petroleum Engineers Inc., #1 Federal Ormsbey (1979)