Amoco Production, Powell, WY No description specified. 1-2 (2 Records) Documents Letter Report: An Intensive Cultural Resource Survey of the Amoco Cottonwood Creek #68 Water Injection Line, Washakie County, Wyoming (1981) Letter Report: Final Archeological Report On Pec Archeological Survey 78-WY-048 for Cottonwood Creek Pnosphoria Unit (1978)