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  1. By: Leary, Richard L. - Pfefferkorn, Hermann W. - Illinois State Museum.
    Publication info: Urbana, Illinois State Geological Survey, 1977
    Holding Institution: University Library, University of Illinois Urbana Champaign
  2. 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
  3. By: Pfefferkorn, Hermann W.
    Publication info: Chicago, Field Museum of Natural History, 1976
    Holding Institution: University Library, University of Illinois Urbana Champaign
  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
  1. By: Dimichele, William A - Gastaldo, Robert A - Pfefferkorn, Hermann W.
    Type: Article
    In: Proceedings of the California Academy of Sciences, 4th series
    Volume: 56, Supplement I
    Issue: 4
    Date: 2005-06-03
    Page Range: 32--49
    Publication Info: San Francisco California Academy of Sciences