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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Benson, Seth B. (Seth Bertram), - Tillotson, Daniel F.
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 52
    Date: 1939
    Page Range: 151--153
    Publication Info: Washington, Biological Society of Washington,
  2. By: Benson, Seth B. (Seth Bertram), - Tillotson, Daniel F.
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 53
    Date: 1940
    Page Range: 93--93
    Publication Info: Washington, Biological Society of Washington,