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  1. By: Briggs, Robert,
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 16
    Issue: 98
    Date: 1876
    Page Range: 310--318
    Publication Info: Philadelphia, American Philosophical Society,
  2. By: Briggs, Robert,
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 17
    Issue: 100
    Date: 1877
    Page Range: 124--127
    Publication Info: Philadelphia, American Philosophical Society,