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  1. By: Cowan, P J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 126
    Date: 2006
    Page Range: 55--59
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Cowan, P J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 103
    Date: 1983
    Page Range: 44--47
    Publication Info: London, British Ornithologists' Club, 1893-
  3. By: Cowan, P J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 102
    Date: 1982
    Page Range: 32--35
    Publication Info: London, British Ornithologists' Club, 1893-
  4. By: Cowan, P J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 117
    Date: 1997
    Page Range: 299--303
    Publication Info: London, British Ornithologists' Club, 1893-