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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Youden, George H.
    Type: Article
    In: The entomologist's record and journal of variation
    Volume: 98
    Date: 1986
    Page Range: 8--8
    Publication Info: [London s.n
  2. By: Youden, George H.
    Type: Article
    In: The entomologist's record and journal of variation
    Volume: 88
    Date: 1976
    Page Range: 280--280
    Publication Info: [London s.n
  3. By: Youden, George H.
    Type: Article
    In: The entomologist's record and journal of variation
    Volume: 87
    Date: 1975
    Page Range: 92--92
    Publication Info: [London s.n
  4. By: Youden, George H.
    Type: Article
    In: The entomologist's record and journal of variation
    Volume: 91
    Date: 1979
    Page Range: 15--15
    Publication Info: [London s.n
  5. By: Youden, George H.
    Type: Article
    In: The entomologist's record and journal of variation
    Volume: 86
    Date: 1975
    Page Range: 197--197
    Publication Info: [London s.n