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  1. By: Penn, George Henry,
    Publication info: 1953
    Holding Institution: American Museum of Natural History Library
  2. By: Penn, George Henry,
    Publication info: New York, American Museum of Natural History, [1953]
    Holding Institution: American Museum of Natural History Library
  1. By: Penn, George Henry,
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 76
    Date: 1963
    Page Range: 121--125
    Publication Info: Washington, Biological Society of Washington,
  2. By: Stone, Alan - Penn, George Henry,
    Type: Article
    In: Journal of the Washington Academy of Sciences
    Volume: 37
    Date: 1947
    Page Range: 89--91
    Publication Info: Washington [etc Washington Academy of Sciences]