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5by Young, Duncan A.“...U.S. Geological Survey,...”
Published 2003
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17Published 1989“...Dept. of the Interior, U.S. Geological Survey,...”
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19Published 2003“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
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20by Brian, Antony W.“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
Published 2005
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