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1by Hill, Robert Thomas, 1858-1941“...U.S. Geological Survey bulletin ;...”
Published 1887
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2by Cobban, William A., 1916-2015“...U.S. Geological Survey bulletin ;...”
Published 1985
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3by Dart, R. L. (Richard L.)“...U.S. Geological Survey bulletin ;...”
Published 1990
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4by Dart, R. L. (Richard L.)“...U.S. Geological Survey bulletin ;...”
Published 1990
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5by Cobban, William A., 1916-2015“...U.S. Geological Survey bulletin ;...”
Published 1985
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6by Bartberger, Charles E.“...U.S. Geological Survey bulletin ;...”
Published 2003
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7by Gannett, Henry, 1846-1914“...U.S. Geological Survey. Bulletin ;...”
Published 1904
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8by Gannett, Henry, 1846-1914“...U. S. Geological survey Bulletin no. 190. ser. F, Geography, 28...”
Published 1902
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9by Hayes, C. W. (Charles Willard), 1859-1916“...U.S. Geological Survey. Bulletin ;...”
Published 1903
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11by Cragin, Francis Whittemore, 1858-1937“...U.S. Geological Survey. Bulletin ;...”
Published 1905
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