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  1. Pennsylvanian tree fern compressions Caulopteris, Megaphyton, and Artisophyton gen. nov. in Illinois /
    By: Pfefferkorn, Hermann W. - Illinois State Geological Survey. - Illinois.
    Publication info: Urbana :Illinois State Geological Survey,1976.
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  2. Quail and pheasant studies in an orchard county / Frank C. Bellrose, Jr.
    By: Bellrose, Frank Chapman, - Illinois.
    Publication info: Urbana, Ill. :Published by authority of the State of Illinois, Natural History Survey,[1940]
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  3. Relative growth in polyodon / David H. Thompson.
    By: Thompson, David Hiram, - Illinois.
    Publication info: Urbana :State of Illinois, Natural History Survey,[1934]
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