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  1. By: Stearn, William T - Watson, William Sir
    Type: Article
    In: Arnoldia
    Volume: 32
    Issue: 4
    Date: 1972
    Page Range: 173--197
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University
  2. By: Watson, William Sir
    Type: Article
    In: Philosophical transactions of the Royal Society of London
    Volume: 50
    Issue: 2
    Date: 1758
    Page Range: 652-688
    Publication Info: London, Royal Society of London, [1666]-1886