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2Published 1997“...The Survey ;...”
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5by McGill, George E.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2004
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6by McGill, George E.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2005
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7Published 2002“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
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8Published 2000“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
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