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  1. By: Pickering, Spencer U., - Theobald, Fred. V. (Frederick Vincent),
    Publication info: London, Simpkin, Marshall, Hamilton, Kent, 1908
    Holding Institution: NCSU Libraries
  1. By: Pickering, Spencer U.,
    Type: Article
    In: Annals of botany
    Volume: 31
    Date: 1917-04
    Page Range: 181--187
    Publication Info: London, Academic Press [etc.],