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  1. By: Rhoads, Samuel N. (Samuel Nicholson), - Young, Robert T.
    Type: Article
    In: Proceedings of the Academy of Natural Sciences of Philadelphia
    Volume: 49
    Date: 1897
    Page Range: 303--312
    Publication Info: Philadelphia, Academy of Natural Sciences of Philadelphia,
  2. By: Young, Robert T.
    Type: Article
    In: Proceedings of the Academy of Natural Sciences of Philadelphia
    Volume: 61
    Date: 1909
    Page Range: 298--298
    Publication Info: Philadelphia, Academy of Natural Sciences of Philadelphia,