Preliminary Surficial Geologic Map of the Powell 30' x 60' Quadrangle, Bighorn [sic] and Park Counties, Wyoming, and Southern Montana (1999)

Hallberg, L.L., and Case, J.C., 1999, Preliminary digital surficial geologic map of the Powell 30' x 60' quadrangle, Bighorn [sic] and Park counties, Wyoming, and southern Montana: Wyoming State Geological Survey Hazards Section Digital Map 99-3, scale 1:100,000.