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1by Spitz, Frederick J.“...U.S. Geological Survey,...”
Published 2007
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2by Spitz, Frederick J.“...U.S. Geological Survey,...”
Published 2009
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6by Spitz, Frederick J.“...U.S. Geological Survey,...”
Published 1996
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7by Spitz, Frederick J.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2008
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Government Document eBook