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  1. By: Dowsett, Robert J - Tree, A. J.
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 84
    Date: 1964
    Page Range: 52--54
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Tree, A. J.
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 85
    Date: 1965
    Page Range: 159--161
    Publication Info: London, British Ornithologists' Club, 1893-