[Washington, D.C.] : U.S. G.P.O. ; Denver, CO : For sale by the Books and Open-File Reports Section, U.S. Geological Survey, 1990
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Book
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Full Title:
Ammonites and some characteristic bivalves from the Upper Cretaceous Frontier Formation, Natrona County, Wyoming / by William A. Cobban
Series Titles:
Evolution of sedimentary basins--Powder River Basin ; ch. B U.S. Geological Survey bulletin ; 1917-B Evolution of sedimentary basins--Powder River Basin ; ch. B. U.S. Geological Survey bulletin ; 1917-B.