Geologic Map of the Newcastle 30' x 60' Quadrangle, Weston and Niobrara Counties, Wyoming, and Pennington and Custer Counties, South Dakota (2006)

McLaughlin, J.F., and Ver Ploeg, A.J., 2006, Geologic map of the Newcastle 30' x 60' quadrangle, Weston and Niobrara counties, Wyoming, and Pennington and Custer counties, South Dakota: Wyoming State Geological Survey Map Series 71, scale 1:100,000.