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1Published 1986“...U.S. Geological Survey bulletin ;...”
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2
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3Published 1996“...U.S. Geological Survey bulletin ;...”
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4by DeWitt, Ed“...U.S. Geological Survey bulletin ;...”
Published 1995
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5Published 1990“...U.S. Geological Survey bulletin ;...”
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6by DeWitt, Ed“...U.S. Geological Survey bulletin ;...”
Published 1989
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7Published 1989“...U.S. Geological Survey bulletin ;...”
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8Published 1988“...U.S. Geological Survey bulletin ;...”
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9by DeWitt, Ed“...U.S. Geological Survey bulletin ;...”
Published 1989
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10by DeWitt, Ed“...U.S. Geological Survey bulletin ;...”
Published 1988
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11