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1Published 1991“...U.S. Geological Survey :...”
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2by Chleborad, A. F.“...U.S. Geological Survey,...”
Published 2006
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3by Harp, Edwin L.“...U.S. Geological Survey,...”
Published 2006
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5by Booth, Derek B.“...U.S. Geological Survey,...”
Published 2005
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8Published 2001“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
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9by Debray, S.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2001
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10by Savage, William Z.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2000
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11Published 2007“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
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12by Booth, Derek B.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2009
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13by Sabol, Martha“...Dept. of the Interior, U.S. Geological Survey ;...”
Published 1988
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14by Turney, Gary L.“...Dept. of the Interior, U.S. Geological Survey ;...”
Published 1989
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15Published 1992“...U.S. Dept. of the Interior, Geological Survey :...”
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