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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Shipp, R L - Yerger, Ralph W.
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 82
    Date: 1969
    Page Range: 477--488
    Publication Info: Washington, Biological Society of Washington,
  2. By: Hastings, Phil A - Shipp, R L
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 93
    Date: 1981
    Page Range: 875--886
    Publication Info: Washington, Biological Society of Washington,