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2Published 1858Subjects: “...Geology....”
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7Published 1849Subjects: “...Geology....”
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8Published 1933Subjects: “...Geological Survey (U.S.)...”
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9Published 1886Subjects: “...Geological surveys....”
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10Published 1890Subjects: “...Geological surveys....”
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11Published 1884Subjects: “...Geological surveys....”
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12Published 1909Subjects: “...Geological Survey (U.S.)...”
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13Published 1909Subjects: “...Geological Survey (U.S.)...”
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14Published 1950Subjects: “...Geological Survey (U.S.)...”
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