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  1. By: Delmar, Alexander
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 14
    Issue: 93
    Date: 1874
    Page Range: 232--255
    Publication Info: Philadelphia, American Philosophical Society,
  2. By: Delmar, Alexander
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 14
    Issue: 94
    Date: 1875
    Page Range: 301--343
    Publication Info: Philadelphia, American Philosophical Society,