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4Published 1988“...American Bottom (Ill.) Antiquities....”
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5“...American Bottom (Ill.) Antiquities....”
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11Published 1994“...American Bottom (Ill.) Antiquities....”
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15Published 1987“...American Bottom (Ill.) Antiquities....”
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16Published 1989“...American Bottom (Ill.) Antiquities....”
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17by Higgins, Michael J. (Michael John)“...American Bottom (Ill.) Antiquities....”
Published 1990
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