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  1. By: Towle, Margaret Ashley
    Type: Article
    In: Botanical Museum leaflets, Harvard University
    Volume: 15
    Issue: 9
    Date: 1952-11-10
    Page Range: 223--246
    Publication Info: Cambridge, Mass Botanical Museum, Harvard University 1932-
  2. By: Towle, Margaret Ashley
    Type: Article
    In: Botanical Museum leaflets, Harvard University
    Volume: 15
    Issue: 6
    Date: 1952-03-12
    Page Range: 171--184
    Publication Info: Cambridge, Mass Botanical Museum, Harvard University 1932-