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  1. By: Friedman, William E. - Dosmann, Michael S. - Boland, Timothy M. - Boufford, David E. - Donoghue, Michael J. - Gapinski, Andrew - Hufford, Larry - Meyer, Paul W. - Pfister, Donald H.
    Type: Article
    In: Arnoldia
    Volume: 73
    Issue: 3
    Date: 2016
    Page Range: 2--18
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University
  2. By: Friedman, William E.
    Type: Article
    In: Arnoldia
    Volume: 71
    Issue: 1
    Date: 2013
    Page Range: 2--14
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University