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  1. 1
    Geology of the conterminous United States at 1:2,500,000 scale : a digital representation of the 1974 P.B. King and H.M. Beikman map /
    Published 1998
    Subjects: “...Geology United States Maps....”
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    Government Document Software Map eBook
  2. 2
    Geologic cross section A-A' through the Appalachian Basin from the southern margin of the Ontario Lowlands Province, Genesee County, western New York, to the Valley and Ridge Province, Lycoming County, north-central Pennsylvania /
    “...United States Appalachian Basin. fast (OCoLC)fst01251334...”
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    Government Document Map eBook
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