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1Subjects: “...Paleontology Illinois Grundy County....”
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2by Leonard, A. Byron (Arthur Byron), 1902-1987Subjects: “...Paleontology Illinois Livingston County....”
Published 1974
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3Published 1946Subjects: “...Paleontology Illinois....”
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14by Cooper, Chalmer Lewis, 1898-Subjects: “...Paleontology Illinois Johnson County....”
Published 1947
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19by Wanless, Harold R. (Harold Rollin), 1899-1970Subjects: “...Paleontology Illinois Crawford County....”
Published 1958
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20by Leonard, A. Byron (Arthur Byron), 1902-1987Subjects: “...Paleontology Illinois....”
Published 1971
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