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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Van Doesburg, P H
    Type: Article
    In: Entomologische berichten
    Volume: 30
    Issue: 8
    Date: 1970
    Page Range: 157--158
    Publication Info: Amsterdam
  2. By: Van Doesburg, P H
    Type: Article
    In: Entomologische berichten
    Volume: 31
    Issue: 11
    Date: 1971
    Page Range: 207--214
    Publication Info: Amsterdam
  3. By: Van Doesburg, P H - Siwi, S S
    Type: Article
    In: Entomologische berichten
    Volume: 43
    Issue: 10
    Date: 1983
    Page Range: 153--155
    Publication Info: Amsterdam