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  1. By: Brotherton, Wilbur - Bartlett, Harley Harris,
    Type: Article
    In: American journal of botany
    Volume: 5
    Issue: 4
    Date: 1918-04
    Page Range: 192--206
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-
  2. By: Brotherton, Wilbur
    Type: Article
    In: Botanical gazette
    Volume: 63
    Issue: 5
    Date: 1917
    Page Range: 417--418
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991