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  1. By: Abbott, C C
    Type: Article
    In: Proceedings of the Academy of Natural Sciences of Philadelphia.
    Volume: 12
    Date: 1860
    Page Range: 475--479
    Publication info: Philadelphia,Academy of Natural Sciences of Philadelphia
  2. By: Abbott, C C
    Type: Article
    In: Proceedings of the Academy of Natural Sciences of Philadelphia.
    Volume: 12
    Date: 1861
    Page Range: 568--569
    Publication info: Philadelphia,Academy of Natural Sciences of Philadelphia