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  1. By: Thompson, W. P.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 35
    Issue: 4
    Date: 1921-04
    Page Range: 74--75
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Thompson, W. P.
    Type: Article
    In: Annals of botany
    Volume: 37
    Date: 1923-04
    Page Range: 183--192
    Publication Info: London, Academic Press [etc.],