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  1. By: Lawrence, George H. M. (George Hill Mathewson), - Pennsylvania Horticultural Society.
    Publication info: Philadelphia, Pennsylvania Horticultural Society, 1978
    Holding Institution: Pennsylvania Horticultural Society
    BHL Collections: Expanding Access to Biodiversity Literature
  1. By: Lawrence, George H. M. (George Hill Mathewson),
    Type: Article
    In: Arnoldia
    Volume: 30
    Issue: 2
    Date: 1970
    Page Range: 56--66
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University