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3Published 1989“...U.S. Geological Survey ;...”
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4Published 1990“...U.S. Geological Survey ;...”
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5Published 1990“...U.S. Geological Survey ;...”
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6Published 1991“...U.S. Geological Survey ;...”
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7Published 1992“...U.S. Geological Survey ;...”
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8Published 1993“...U.S. Geological Survey ;...”
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9
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10Published 1994“...U.S. Geological Survey ;...”
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11by Ziegler, Andrew C.“...U.S. Geological Survey ;...”
Published 1994
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12
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13Published 1997“...U.S. Geological Survey ;...”
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14Published 1997“...U.S. Geological Survey ;...”
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15
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16Published 1994“...U.S. Geological Survey ;...”
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17
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18Published 2003“...U.S. Geological Survey ;...”
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19
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20by Rhea, Susan“...U.S. Geological Survey,...”
Published 1995
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