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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