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  1. By: Casement, Michael
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 128
    Date: 2008
    Page Range: 148--149
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Bourne, W. R. P. (William Richmond Postle), - Casement, Michael
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 116
    Date: 1996
    Page Range: 117--123
    Publication Info: London, British Ornithologists' Club, 1893-