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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Den Boer, M H
    Type: Article
    In: Entomologische berichten
    Volume: 30
    Issue: 4
    Date: 1970
    Page Range: 88--88
    Publication Info: Amsterdam
  2. By: Den Boer, M H
    Type: Article
    In: Entomologische berichten
    Volume: 30
    Date: 1970
    Page Range: 53--57
    Publication Info: Amsterdam