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  1. The Laramie flora of the Denver basin. With a review of the Laramie problem,
    By: Knowlton, Frank Hall,
    Publication info: Washington,Govt. print. off.,1922.
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    Subjects: Cretaceous  Denver Basin  Paleobotany  Tertiary  
    BHL Collections: New York Botanical Garden
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