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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Field, Scott A. - Keller, Michael A
    Type: Article
    In: Journal of Hymenoptera research
    Volume: 3
    Date: 1994
    Page Range: 151--156
    Publication Info: Washington, D.C, International Society of Hymenopterists, [1992-
  2. By: Hendrickson, R M - Keller, Michael A
    Type: Article
    In: Proceedings of the Entomological Society of Washington
    Volume: 85
    Date: 1983
    Page Range: 806--810
    Publication Info: Washington, etc, Entomological Society of Washington,