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  1. By: Mason, I J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 102
    Date: 1982
    Page Range: 99--106
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Mason, I J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 103
    Date: 1983
    Page Range: 123--128
    Publication Info: London, British Ornithologists' Club, 1893-
  3. By: Mason, I J - Mckean, J L
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 102
    Date: 1982
    Page Range: 127--129
    Publication Info: London, British Ornithologists' Club, 1893-