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  1. By: Phillips, Tom Lee,
    Publication info: Urbana,Illinois State Geological Survey,1973.
    Holding Institution: University Library, University of Illinois Urbana Champaign
  2. By: Phillips, Tom Lee, - Avcin, Matthew J., - Berggren, Dwain,
    Publication info: Urbana :Illinois State Geological Survey,1976.
    Holding Institution: University Library, University of Illinois Urbana Champaign
  3. 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