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  1. By: Matthews, Gregory M
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 50
    Date: 1929
    Page Range: 10--11
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Matthews, Gregory M
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 45
    Date: 1925
    Page Range: 93--94
    Publication Info: London, British Ornithologists' Club, 1893-