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1Published 1972Subjects: “...Paleolimnology Illinois....”
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2
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3Published 1974Subjects: “...Sediments (Geology) Illinois....”
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4Published 1976Subjects: “...Gravity Illinois....”
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10Published 1990Subjects: “...Corn Illinois....”
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17
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18by Moulton, Gail Francis, 1898-Subjects: “...Petroleum Illinois Clark County....”
Published 1926
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19by Peppers, Russel A. (Russel Allen), 1932-Subjects: “...Paleobotany Illinois Basin....”
Published 1997
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20Published 1991Subjects: “...Geology Illinois Saline County....”
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