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  1. By: Tyson, William,
    Publication info: [Cape town, The author], 1909-
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
  1. By: Tyson, William,
    Type: Article
    In: South African journal of natural history
    Volume: 2
    Issue: 2
    Date: 1920
    Page Range: 288--293
    Publication Info: Pretoria, South African Biological Society,