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1Published 1986Subjects: “...Geology Pennsylvania Bibliography....”
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2Published 1988Subjects: “...Geological Survey (U.S.) Bibliography Catalogs....”
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3Published 1983Subjects: “...Geology Pennsylvania Bibliography Catalogs....”
Government Document Book -
4Published 1988“...Pennsylvania Maps, Topographic Bibliography Catalogs....”
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5Published 1977Government Document Book
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12Government Document Book
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15Published 1985Government Document Book
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