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  1. By: Gruber, Charles M.
    Type: Article
    In: The Kansas University science bulletin
    Volume: 7
    Issue: 11
    Date: 1913-01-01
    Page Range: 212--215
    Publication Info: Lawrence, Kan, The University, 1902-1924
  2. By: Gruber, Charles M.
    Type: Article
    In: The Kansas University science bulletin
    Volume: 7
    Issue: 10
    Date: 1913-01-01
    Page Range: 207--210
    Publication Info: Lawrence, Kan, The University, 1902-1924