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Reston, Va. : The Survey, 1990
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Government Document
Conference Proceeding
Book
4
Washington : U.S. G.P.O., 1989
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Government Document
Conference Proceeding
Book
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Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey, 2010
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Government Document
Conference Proceeding
Book
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Reston, Va. : Denver, CO : U.S. Geological Survey ; For sale by U.S. Geological Survey, Information Services, 1995
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Government Document
Conference Proceeding
Book
8
Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey, 2004
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Government Document
Conference Proceeding
Book
9
Washington, District of Columbia : The National Academies Press, 2008
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Conference Proceeding
Book
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