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  1. By: Borrett, R. P. - Jackson, H D
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 90
    Date: 1970
    Page Range: 124--129
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Borrett, R. P.
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 89
    Date: 1969
    Page Range: 165--165
    Publication Info: London, British Ornithologists' Club, 1893-