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  1. By: Robertson, H A - James, P C
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 108
    Date: 1988
    Page Range: 79--87
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: James, P C - Robertson, H A
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 105
    Date: 1985
    Page Range: 25--26
    Publication Info: London, British Ornithologists' Club, 1893-