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  1. By: Williams, A J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 100
    Date: 1980
    Page Range: 173--175
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Williams, A J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 100
    Date: 1980
    Page Range: 208--212
    Publication Info: London, British Ornithologists' Club, 1893-
  3. By: Powell, C Mca - Fergusson, Christopher L. - Williams, A J
    Type: Article
    In: Proceedings of the Linnean Society of New South Wales
    Volume: 104
    Date: 1981
    Page Range: 195--210
    Publication Info: Sydney Linnean Society of New South Wales