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  1. By: Postman, Joseph
    Type: Article
    In: Arnoldia
    Volume: 67
    Issue: 1
    Date: 2009
    Page Range: 2--9
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University
  2. By: Catling, Paul M. - Cayouette, Jacques, - Postman, Joseph
    Type: Article
    In: Rhodora
    Volume: 97
    Date: 1995
    Page Range: 245--254
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],