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  1. By: Young, W. J.
    Type: Article
    In: American journal of botany
    Volume: 10
    Issue: 6
    Date: 1923-06
    Page Range: 325--335
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-
  2. By: Young, W. J.
    Type: Article
    In: American journal of botany
    Volume: 9
    Issue: 5
    Date: 1922-05
    Page Range: 213--214
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-