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  1. By: Richards, Theodore William
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 42
    Issue: 172
    Date: 1903
    Page Range: 28--36
    Publication Info: Philadelphia, American Philosophical Society,
  2. By: Richards, Theodore William
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 43
    Issue: 176
    Date: 1904
    Page Range: 116--122
    Publication Info: Philadelphia, American Philosophical Society,