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  1. By: Schoorl, J W
    Type: Article
    In: Entomologische berichten
    Volume: 59
    Issue: 5
    Date: 1999
    Page Range: 68--70
    Publication Info: Amsterdam
  2. By: Schoorl, J W
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 107
    Date: 1987
    Page Range: 165--168
    Publication Info: London, British Ornithologists' Club, 1893-