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  1. By: Easton, William H. (William Heyden),
    Publication info: Urbana, Illinois, 1944
    Holding Institution: University Library, University of Illinois Urbana Champaign
  2. By: Easton, William H. (William Heyden),
    Publication info: Urbana, Illinois State Geological Survey, 1945
    Holding Institution: University Library, University of Illinois Urbana Champaign