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1Published 1987“...The Survey ;...”
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2Published 1988“...The Survey ;...”
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3Published 1989“...The Survey ;...”
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4Published 1994“...The Survey ;...”
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5Published 1994“...The Survey ;...”
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8by Bender, Kelly C.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2000
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