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1by Smith, Kirk P.“...U.S. Geological Survey,...”
Published 2007
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2by Smith, Kirk P.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2011
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3by Smith, Kirk P.“...U.S. Department of the Interior, U.S. Geological Survey,...”
Published 2013
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4by Sorenson, Jason R.“...U.S. Department of the Interior, U.S. Geological Survey,...”
Published 2013
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5“...U.S. Department of the Interior, U.S. Geological Survey,...”
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Government Document eBook