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Please read BHL's Acknowledgment of Harmful Content
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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