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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Adkison, Daniel L. - Heard, Richard W. - Clark, Guy T.
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 95
    Date: 1982
    Page Range: 334--337
    Publication Info: Washington, Biological Society of Washington,
  2. By: Clark, Guy T. - Fricke, Ronald A
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 98
    Date: 1985
    Page Range: 539--543
    Publication Info: Washington, Biological Society of Washington,