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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Viosca, Percy,
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 41
    Date: 1928
    Page Range: 89--91
    Publication Info: Washington, Biological Society of Washington,
  2. By: Viosca, Percy,
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 51
    Date: 1938
    Page Range: 143--146
    Publication Info: Washington, Biological Society of Washington,