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1by Hickman, R. Edward“...U.S. Geological Survey ;...”
Published 1999
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2by Volkert, Richard A.“...U.S. Geological Survey ;...”
Published 1999
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3
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4Published 1900“...U.S. Geological Survey :...”
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5Published 1989“...U.S. Geological Survey ;...”
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7Published 1992“...U.S. Geological Survey ;...”
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8Published 1992“...U.S. Geological Survey ;...”
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9by Hickman, R. Edward“...U.S. Geological Survey ;...”
Published 1992
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10by Gohn, Gregory S.“...U.S. Geological Survey ;...”
Published 1992
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11Published 1993“...U.S. Geological Survey ;...”
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12Published 1994“...U.S. Geological Survey ;...”
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13Published 1993“...U.S. Geological Survey ;...”
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15by Reed, Timothy J.“...U.S. Geological Survey ;...”
Published 1995
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16by Lacombe, Pierre (Pierre J.)“...U.S. Geological Survey ;...”
Published 1996
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20Published 2002“...U.S. Geological Survey,...”
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