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1Published 1999Subjects: “...Geology....”
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2Published 1982Subjects: “...Geology....”
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3Published 2002Subjects: “...Geological Survey (U.S.)...”
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4Published 1988Subjects: “...Geological Survey (U.S.)...”
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5Published 2000Subjects: “...Geological Survey (U.S.)...”
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6Published 1986Subjects: “...Geological Survey (U.S.)...”
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7Published 1988Subjects: “...Geological Survey (U.S.)...”
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