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1Published 1987“...The Survey,...”
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4Published 1990“...Dept. of the Interior, U.S. Geological Survey,...”
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5Published 1992“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
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6by Brigham, Mark E.“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
Published 1999
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7“...U.S. Department of the Interior, U.S. Geological Survey,...”
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