Geologic and structure map, with contours on top of the Pierre Shale, for the south half of the Powder River Basin, northeastern Wyoming U.S. Department of the Interior, U.S. Geological Survey ; by N.M. Denson, M.L. Gibson, and G.L. Sims
Series Titles:
Miscellaneous investigations series ; map I-2343-B Miscellaneous investigations series (Geological Survey (U.S.)) ; I-2343-B.