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1Published 1976“...Geological Survey circular ;...”
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2Published 1979“...Geological Survey circular ;...”
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3Published 1979“...Geological Survey circular ;...”
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4
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5Published 1981“...Geological Survey circular ;...”
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6Published 1982“...Geological Survey circular ;...”
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7Published 1983“...Geological Survey circular ;...”
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8Published 1985“...U.S. Geological Survey circular ;...”
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9by Burford, Robert O.“...U.S. Geological Survey circular ;...”
Published 1984
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10by Smith, Lawrence H.“...U.S. Geological Survey circular ;...”
Published 1987
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11by Dellinger, D. A.“...U.S. Geological Survey circular ;...”
Published 1989
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12Published 1990“...U.S. Geological Survey circular ;...”
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13Published 1989“...U.S. Geological Survey circular ;...”
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14Published 1992“...U.S. Geological Survey circular ;...”
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15Published 1994“...U.S. Geological Survey circular ;...”
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16Published 1998“...U.S. Geological Survey circular ;...”
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17Published 2000“...U.S. Geological Survey circular ;...”
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18
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19Published 2004“...U.S. Geological Survey circular ;...”
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20by Chin, John L.“...U.S. Geological Survey circular ;...”
Published 2004
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