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1Published 1888Subjects: “...Geology....”
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2Published 1896Subjects: “...Geology....”
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3Published 1898Subjects: “...Geology....”
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4Published 1921Subjects: “...Geological Survey (U.S.)...”
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5Published 1932Subjects: “...Geological Survey (U.S.)...”
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6Published 1917Subjects: “...Geological Survey (U.S.)...”
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7Published 1895Subjects: “...Geological Survey (U.S.)...”
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8Published 1908Subjects: “...Geological Survey (U.S.)...”
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