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  1. By: Clark, William S. - Clarke, Roger
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 118
    Date: 1998
    Page Range: 52--54
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Clarke, Roger
    Type: Article
    In: The journal of the Bombay Natural History Society
    Volume: 93
    Date: 1996
    Page Range: 44--50
    Publication Info: Bombay Bombay Natural History Society 1886-