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  1. By: Schopf, James Morton, - Wilson, L. R. (Leonard Richard), - Bentall, Ray,
    Publication info: Urbana :Illinois State Geological Survey,1944.
    Holding Institution: University Library, University of Illinois Urbana Champaign
  2. By: Schopf, James Morton,
    Publication info: Urbana, Ill.,1941.
    Holding Institution: University Library, University of Illinois Urbana Champaign
  3. By: Schopf, James Morton,
    Publication info: Urbana,1941.
    Holding Institution: University Library, University of Illinois Urbana Champaign
  4. By: Schopf, James Morton,
    Publication info: Urbana,The University of Illinois Press,1943.
    Holding Institution: University Library, University of Illinois Urbana Champaign
  5. By: Schopf, James Morton,
    Publication info: Urbana, Ill. :State Geological Survey,1939.
    Holding Institution: University Library, University of Illinois Urbana Champaign
  6. By: Schopf, James Morton,
    Publication info: Urbana, Ill.,Printed by authority of the State of Illinois,1938.
    Holding Institution: University Library, University of Illinois Urbana Champaign