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  1. By: Dawson, J. W., (John William),
    Publication info: S.l, s.n, 1870?
    Holding Institution: Canadiana.org
    Subjects: Ferns, Fossil  Paleobotany  
  2. By: Gardner, John Starkie, - Ettingshausen, Constantin, Freiherr von, - Palaeontographical Society (Great Britain)
    Publication info: London, Printed for the Palæontographical society, 1879-86
    Holding Institution: Smithsonian Libraries and Archives
    Subjects: England  Eocene  Ferns, Fossil  Gymnosperms, Fossil  Paleobotany  
  3. By: Pfefferkorn, Hermann W. - Illinois. Dept. of Registration and Education. - Illinois State Geological Survey.
    Publication info: Urbana, Illinois State Geological Survey, 1976
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Bomen (biologie)  Ferns, Fossil  Illinois  Paleobotany  Pennsylvanian  Varens  
  4. By: Pfefferkorn, Hermann W. - Peppers, Russel A. (Russel Allen), - Phillips, Tom Lee,
    Publication info: Urbana, Illinois State Geological Survey, 1971
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Bevruchting  Ferns, Fossil  Flora (biologie)  Grundy County  Illinois  Paleobotany  Pennsylvanian  Plants, Fossil  Varens  Will County