Geologic Map of the Sheridan 30' x 60' Quadrangle, Sheridan, Johnson, and Campbell Counties, Wyoming, and Southeastern Montana (2003)

Ver Ploeg, A.J., and Boyd, C.S., 2003, Geologic map of the Sheridan 30' x 60' quadrangle, Sheridan, Johnson, and Campbell counties, Wyoming, and southeastern Montana: Wyoming State Geological Survey Map Series 64, scale 1:100,000.