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1by Mugel, Douglas N.“...U.S. Geological Survey,...”
Published 1996
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2by Richards, Joseph M.“...U.S. Geological Survey,...”
Published 2010
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3“...U.S. Department of Interior, U.S. Geological Survey,...”
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4by Richards, Joseph M.“...U.S. Department of the Interior, U.S. Geological Survey,...”
Published 2013
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5“...U.S. Department of Interior, U.S. Geological Survey,...”
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Government Document eBook -
6“...U.S. Department of the Interior, U.S. Geological Survey,...”
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Government Document eBook