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  1. By: Wilkinson, R - Aidley, D J
    Type: Article
    In: Bulletin of the British Ornithologists' Club.
    Volume: 103
    Date: 1983
    Page Range: 135--138
    Publication info: London :British Ornithologists' Club,1893-
  2. By: Wilkinson, R - Beecroft, R - Aidley, D J
    Type: Article
    In: Bulletin of the British Ornithologists' Club.
    Volume: 102
    Date: 1982
    Page Range: 139--140
    Publication info: London :British Ornithologists' Club,1893-