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  1. By: Cresson, Hilborne T. (Hilborne Thomson),
    Type: Article
    In: Proceedings of the Academy of Natural Sciences of Philadelphia
    Volume: 35
    Date: 1883
    Page Range: 43--44
    Publication Info: Philadelphia, Academy of Natural Sciences of Philadelphia,
  2. By: Cresson, Hilborne T. (Hilborne Thomson),
    Type: Article
    In: Proceedings of the Academy of Natural Sciences of Philadelphia
    Volume: 35
    Date: 1883
    Page Range: 55--56
    Publication Info: Philadelphia, Academy of Natural Sciences of Philadelphia,