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  1. By: Williams, Frederic Newton,
    Type: Article
    In: Bulletin de l'Herbier Boissier
    Volume: 8
    Series: 2
    Issue: 6
    Date: 1908-06
    Page Range: 402--409
    Publication Info: Genève, Impr. Romet, 1893-1908
  2. By: Williams, Frederic Newton,
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1891-10-07
    Publication Info: [1833-1900]
  3. By: Williams, Frederic Newton,
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1891-09-17
    Publication Info: [1833-1900]