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  1. By: Yule, George Udny,
    Publication info: Cambridge, University Press, 1920
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  1. By: Yule, George Udny,
    Type: Article
    In: Annals of botany
    Volume: 37
    Date: 1923-07
    Page Range: 541--542
    Publication Info: London, Academic Press [etc.],