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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: Leary, Richard L. - Trask, C. Brian. - Geological Society of America. Meeting Northern Illinois University) - Geological Society of America. North-Central Section. Meeting Northern Illinois University)
    Publication info: Champaign, Ill, Illinois State Geological Survey, 1985
    Holding Institution: University Library, University of Illinois Urbana Champaign