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  1. By: Mason, William Pitt
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 46
    Issue: 185
    Date: 1907
    Page Range: 110--116
    Publication Info: Philadelphia, American Philosophical Society,
  2. By: Mason, William Pitt
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 48
    Issue: 191
    Date: 1909
    Page Range: 67--68
    Publication Info: Philadelphia, American Philosophical Society,