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    Ammonites and some characteristic bivalves from the Upper Cretaceous Frontier Formation, Natrona County, Wyoming by Cobban, William A., 1916-2015

    Published: U.S. G.P.O. ; For sale by the Books and Open-File Reports Section, U.S. Geological Survey, 1990
    Description: iv, 13 pages, 11 pages of plates : illustrations, maps ; 28 cm.
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    Ammonites and some characteristic bivalves from the Upper Cretaceous Frontier Formation, Natrona County, Wyoming
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    Ammonites and some characteristic bivalves from the Upper Cretaceous Frontier Formation, Natrona County, Wyoming by Cobban, William A., 1916-2015

    Published: Department of the Interior, U.S. Geological Survey, 1990
    Description: 1 online resource (iv, 13 pages, 11 pages of plates) : illustrations, maps.
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    Ammonites and some characteristic bivalves from the Upper Cretaceous Frontier Formation, Natrona County, Wyoming

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