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  1. By: Billings, Frederick H. (Frederick Horatio), - Glenn, Pressley A.
    Publication info: Washington, Govt. print. off, 1911
    Holding Institution: Library of Congress
  1. By: Glenn, Pressley A.
    Type: Article
    In: The Kansas University science bulletin
    Volume: 14
    Issue: 10
    Date: 1922-10
    Page Range: 315--323
    Publication Info: Lawrence, Kan, The University, 1902-1924