Preliminary Digital Surficial Geologic Map of the Lance Creek 30' x 60' Quadrangle, Niobrara and Converse Counties, Wyoming, Southwestern South Dakota, and Northwestern Nebraska (2001)

Hallberg, L.L., and Case, J.C., 2001, Preliminary digital surficial geologic map of the Lance Creek 30' x 60' quadrangle, Niobrara and Converse counties, Wyoming, southwestern South Dakota, and northwestern Nebraska: Wyoming State Geological Survey Hazards Section Digital Map 01-4, scale 1:100,000.