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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Janzen, D H - Walker, A. K. - Whitfield, James B. (James Bryan), - Delvare, Gérard - Gauld, Ian D.
    Type: Article
    In: Journal of Hymenoptera research
    Volume: 12
    Date: 2003
    Page Range: 42--76
    Publication Info: Washington, D.C, International Society of Hymenopterists, [1992-