Preliminary Digital Surficial Geologic Map of the Sheridan 30’ x 60’ Quadrangle, Sheridan, Johnson, and Campbell Counties, Wyoming, and Southeastern Montana (1999)

Hallberg, L.L., and Case, J.C., 1999, Preliminary digital surficial geologic map of the Sheridan 30' x 60' quadrangle, Sheridan, Johnson, and Campbell counties, Wyoming, and southeastern Montana: Wyoming State Geological Survey Hazards Section Digital Map 99-5, scale 1:100,000.