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    Permian or "permo-carboniferous" of the eastern foothills of the Rocky Mountains in Colorado /

    Permian or "permo-carboniferous" of the eastern foothills of the Rocky Mountains in Colorado / by Butters, R.M. (Roy Morrill)

    Published 1913
    Thesis Book
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  2. 2
    The geology of the Ward region, Boulder County, Colorado /

    The geology of the Ward region, Boulder County, Colorado / by Worcester, Philip G. (Philip George), 1884-1970

    Published 1920
    Government Document Thesis Book
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