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  1. By: Leonard, Arthur Byron, - Frye, John Chapman, - Johnson, W. Hilton (William Hilton), - Illinois State Geological Survey.
    Publication info: Urbana, Ill, Illinois State Geological Survey, 1971
    Holding Institution: University Library, University of Illinois Urbana Champaign
  2. By: Illinois State Geological Survey. - Frye, John Chapman,
    Publication info: Urbana, 1974
    Holding Institution: University Library, University of Illinois Urbana Champaign
  3. By: Leonard, Arthur Byron, - Frye, John Chapman,
    Publication info: Urbana, Illinois State Geological Survey, 1960
    Holding Institution: University Library, University of Illinois Urbana Champaign