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  1. By: Allen, Kelsey - Oswald, W. Wyatt
    Type: Article
    In: Arnoldia
    Volume: 78
    Issue: 3
    Date: 2021
    Page Range: 38-41
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University
  2. By: Oswald, W. Wyatt - Richardson, Andrew D.
    Type: Article
    In: Arnoldia
    Volume: 73
    Issue: 2
    Date: 2015
    Page Range: 36--39
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University