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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Cowan, D P - Waldbauer, Gilbert
    Type: Article
    In: Proceedings of the Entomological Society of Washington
    Volume: 86
    Date: 1984
    Page Range: 930--934
    Publication Info: Washington, etc, Entomological Society of Washington,
  2. By: Cowan, D P
    Type: Article
    In: Proceedings of the Entomological Society of Washington
    Volume: 88
    Date: 1986
    Page Range: 531--541
    Publication Info: Washington, etc, Entomological Society of Washington,