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Crock J G
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Crock, J. G.
Reston, Va. : U.S. Geological Survey, 2009.
2009
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Reston, Va. : U.S. Geological Survey, 2008.
2008
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Crock, J. G.
Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey, 2006.
2006
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Yager, Tracy J. B., author.
Reston, Va. : U.S. Department of the Interior, U.S. Geological Survey, 2004.
2004
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Yager, J. B..
Reston, Va. : U.S. Geological Survey, 2004.
2004
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Denver, CO : U.S. Dept. of the Interior, U.S. Geological Survey : Books and Open-File Reports [distributor], 2000.
2000
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Reston, Va. : U.S. Geological Survey, 2007.
2007
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[Denver, Colo.?] : U.S. Dept. of the Interior, U.S. Geological Survey, [2003]
2003
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