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1Published 1889Subjects: “...Geology....”
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2Published 1918Subjects: “...Geological Survey (U.S.)...”
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3Published 1919Subjects: “...Geological Survey (U.S.)...”
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4Published 1906Subjects: “...Geological Survey (U.S.)...”
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5Published 1916Subjects: “...Geological surveys....”
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6Published 1923Subjects: “...Geological Survey (U.S.)...”
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