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1Published 1988“...The Survey ;...”
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2Published 1988“...The Survey ;...”
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3Published 1988“...The Survey ;...”
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4Published 1988“...The Survey ;...”
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5Published 1988“...The Survey ;...”
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6Published 1988“...The Survey ;...”
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7Published 1988“...The Survey ;...”
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8Published 1988“...The Survey ;...”
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9Published 1988“...The Survey ;...”
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10Published 1988“...The Survey ;...”
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11by Konieczki, A. D.“...U.S. Geological Survey ;...”
Published 1997
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12Published 1991“...U.S. Geological Survey ;...”
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13Published 1996“...U.S. Geological Survey :...”
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14by Gauger, Robert W.“...U.S. Geological Survey ;...”
Published 1996
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15Published 1996“...U.S. Geological Survey ;...”
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16Published 1997“...U.S. Geological Survey ;...”
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17
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18Published 2008“...U.S. Geological Survey,...”
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