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1Published 1990“...U.S. Geological Survey ;...”
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3by Horton, J. Wright“...U.S. Geological Survey,...”
Published 2006
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11by Petersen, James C.“...U.S. Geological Survey,...”
Published 2005
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12by Hudson, Mark R.“...U.S. Geological Survey,...”
Published 2006
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13by Billingsley, George H.“...U.S. Geological Survey,...”
Published 2007
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14by Billingsley, George H.“...U.S. Geological Survey,...”
Published 2003
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17Published 2004“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
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18by Brock, John C.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2006
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19Published 2006“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
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20by Brock, John C.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2007
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