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3by McGill, George E.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2004
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4by McGill, George E.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2005
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5Published 2002“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
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6Published 2000“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
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