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  1. By: Angehr, G R - Christian, D G
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 120
    Date: 2000
    Page Range: 173--178
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Angehr, G R - Christian, D G - Aparicio, K. M.
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 124
    Date: 2004
    Page Range: 51--62
    Publication Info: London, British Ornithologists' Club, 1893-