Preliminary Digital Surficial Geologic Map of the Cheyenne 30’ x 60’ Quadrangle, Southeastern Wyoming, Western Nebraska, and Northern Colorado (1998)

Hallberg, L.L., and Case, J.C., 1998, Preliminary digital surficial geologic map of the Cheyenne 30' x 60' quadrangle, southeastern Wyoming, western Nebraska, and northern Colorado: Wyoming State Geological Survey Hazards Section Digital Map 98-4, scale 1:100,000.