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[Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey, 2010.
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Schenk, Christopher J.
[Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey, 2010.
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Crysdale, Bonnie L.
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Geological Survey (U.S.)
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Denver, CO : The Survey : USGS Information Service, 1999.
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Schenk, Christopher J., author.
[Reston, Va.] : Department of the Interior, U.S. Geological Survey, 1987.
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[Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey, 2007.
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Johnson, Samuel Y., author.
Washington, D.C. : Department of the Interior, U.S. Geological Survey, 1987.
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