Preliminary Digital Surficial Geologic Map of the Devils Tower 30’ x 60’ Quadrangle, Crook County, Wyoming, and Western South Dakota, Southeastern Montana (2001)

Hallberg, L.L., and Case, J.C., 2001, Preliminary digital surficial geologic map of the the Devils Tower 30' x 60' quadrangle, Crook County, Wyoming and western South Dakota, southeastern Montana: Wyoming State Geological Survey Hazards Digital Map 01-3, scale 1:100,000.