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1Published 1989“...The Survey ;...”
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2Published 1991“...The Survey ;...”
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3Published 1991“...The Survey ;...”
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4Published 1991“...The Survey ;...”
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5Published 1992“...The Survey ;...”
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6Published 1993“...The Survey ;...”
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7Published 1995“...The Survey ;...”
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8Published 1996“...The Survey ;...”
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9by Chapman, Mary G.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2000
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