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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Thibodeau, Francis R., - Nickerson, N H
    Type: Article
    In: Rhodora
    Volume: 86
    Date: 1984
    Page Range: 389--391
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Falk, Donald A. - Thibodeau, Francis R.,
    Type: Article
    In: Arnoldia
    Volume: 46
    Issue: 3
    Date: 1986
    Page Range: 2--16
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University