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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Higgins, R P
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 82
    Date: 1969
    Page Range: 113--128
    Publication Info: Washington, Biological Society of Washington,
  2. By: Higgins, R P
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 99
    Date: 1986
    Page Range: 399--405
    Publication Info: Washington, Biological Society of Washington,