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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.
    Contributed by: University of Illinois Urbana Champaign
    Subjects: Bomen (biologie)  Ferns, Fossil  Illinois  Paleobotany  Pennsylvanian  Varens  
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  2. Some fern-like fructifications and their spores from the Mazon Creek compression flora of Illinois (Pennsylvanian)
    By: Pfefferkorn, Hermann W. - Peppers, Russel A. - Phillips, Tom Lee,
    Publication info: Urbana,Illinois State Geological Survey,1971.
    Contributed by: University of Illinois Urbana Champaign
    Subjects: Bevruchting  Ferns, Fossil  Flora (biologie)  Grundy County  Illinois  Paleobotany  Pennsylvanian  Plants, Fossil  Varens  Will County  
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