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  1. By: Hubbert, Helen Brewster,
    Publication info: Baltimore, Md, 1915
    Holding Institution: The Johns Hopkins University Sheridan Libraries
  2. By: Hubbert, Helen Brewster,
    Publication info: New York, H. Holt & company, [etc., etc.] 1915
    Holding Institution: University of California Libraries
  1. By: Hubbert, Helen Brewster,
    Type: Article
    In: The Kansas University science bulletin
    Volume: 1
    Issue: 11
    Date: 1902-11
    Page Range: 281--303
    Publication Info: Lawrence, Kan, The University, 1902-1924