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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Roitberg, B - Gries, Gerhard
    Type: Article
    In: Journal of the Entomological Society of British Columbia
    Volume: 98
    Date: 2001
    Page Range: 113--118
    Publication Info: [Victoria, etc.], Entomological Society of British Columbia,
  2. By: Roitberg, B - Gries, Gerhard
    Type: Article
    In: Journal of the Entomological Society of British Columbia
    Volume: 99
    Date: 2002
    Page Range: 143--144
    Publication Info: [Victoria, etc.], Entomological Society of British Columbia,