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  1. By: Becker, Wilhelm
    Publication info: Dresden-N. : Verlag von C. Heinrich, 1910
    Holding Institution: Biblioteca Digital del Real Jardín Botánico de Madrid
  1. By: Becker, Wilhelm
    Type: Article
    In: Bulletin de l'Herbier Boissier
    Volume: 8
    Series: 2
    Issue: 10
    Date: 1908-10
    Page Range: 739--744
    Publication Info: Genève, Impr. Romet, 1893-1908
  2. By: Becker, Wilhelm
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 38
    Date: 1925
    Page Range: 117--117
    Publication Info: Washington, Biological Society of Washington,
  3. By: Becker, Wilhelm
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 41
    Date: 1928
    Page Range: 151--151
    Publication Info: Washington, Biological Society of Washington,