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1Published 1881Subjects: “...Geology....”
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2Published 1931Subjects: “...Geological Survey (U.S.)...”
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3Published 1882Subjects: “...Geological Survey (U.S.)...”
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4Published 1913Subjects: “...Geological Survey (U.S.)...”
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5Published 1911Subjects: “...Geological Survey (U.S.)...”
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6Published 1914Subjects: “...Geological Survey (U.S.)...”
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