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1Published 1998“...[U.S. Geological Survey?],...”
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2Published 1976“...U.S. Geological Survey,...”
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3Published 1979“...U.S. Geological Survey,...”
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4Published 1979“...U.S. Geological Survey,...”
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5Published 1981“...U.S. Geological Survey,...”
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6Published 1980“...U.S. Geological Survey,...”
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7by Waitt, Richard B.“...U.S. Geological Survey,...”
Published 1984
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8Published 1987“...U.S. Geological Survey :...”
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9Published 1991“...U.S. Geological Survey,...”
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10Published 1991“...U.S. Geological Survey,...”
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11Published 1990“...U.S. Geological Survey :...”
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12Published 1990“...U.S. Geological Survey :...”
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13Published 1994“...U.S. Geological Survey,...”
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14Published 1995“...U.S. Geological Survey,...”
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15Published 1986“...U.S. Geological Survey,...”
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16Published 2003“...U.S. Geological Survey,...”
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17Published 2003“...U.S. Geological Survey,...”
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18Published 1988“...U.S. Geological Survey,...”
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19Published 2006“...U.S. Geological Survey,...”
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20Published 2006“...U.S. Geological Survey,...”
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Government Document Conference Proceeding eBook