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  1. By: Abbott , Charles C
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge.
    Volume: 57
    Issue: 220
    Date: 1918
    Page Range: 49--59
    Publication info: Philadelphia :American Philosophical Society
  2. By: Abbott , Charles C
    Type: Article
    In: Proceedings of the Academy of Natural Sciences of Philadelphia.
    Volume: 15
    Date: 1863
    Page Range: 278--279
    Publication info: Philadelphia,Academy of Natural Sciences of Philadelphia