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  1. By: Bachmann, Freda M.
    Type: Article
    In: American journal of botany
    Volume: 5
    Issue: 1
    Date: 1918-01
    Page Range: 32--35
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-
  2. By: Bachmann, Freda M.
    Type: Article
    In: Annals of botany
    Volume: 26
    Date: 1912-07
    Page Range: 747--760
    Publication Info: London, Academic Press [etc.],