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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Kettlewell, Bernard - Gibson, C
    Type: Article
    In: The entomologist's record and journal of variation
    Volume: 85
    Date: 1973
    Page Range: 240--240
    Publication Info: [London s.n
  2. By: Gibson, C
    Type: Article
    In: The entomologist's record and journal of variation
    Volume: 102
    Date: 1990
    Page Range: 85--86
    Publication Info: [London s.n