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  1. By: Harrisson, T H - Marshall, A J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 57
    Date: 1937
    Page Range: 148--150
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Harrisson, T H - Hartley, C H
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 54
    Date: 1934
    Page Range: 148--160
    Publication Info: London, British Ornithologists' Club, 1893-