Preliminary Digital Surficial Geologic Map of the Sundance 30' x 60' Quadrangle, Crook and Weston Counties, Wyoming, and Southwestern South Dakota (2001)

Hallberg, L.L., and Case, J.C., 2001, Preliminary surficial geologic map of the Sundance 30' x 60' quadrangle, Crook and Weston counties, Wyoming, and southwestern South Dakota: Wyoming State Geological Survey Hazards Section Digital Map 01-6, scale 1:100,000.