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  1. By: Hammond, William A
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 20
    Issue: 111
    Date: 1882
    Page Range: 227--228
    Publication Info: Philadelphia, American Philosophical Society,
  2. By: Hammond, William A
    Type: Article
    In: Proceedings of the Academy of Natural Sciences of Philadelphia
    Volume: 10
    Date: 1858
    Page Range: 17--21
    Publication Info: Philadelphia, Academy of Natural Sciences of Philadelphia,