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  1. By: Howell, Steve N G - Webb, Sophie
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 114
    Date: 1994
    Page Range: 232--243
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Mccallum, D Archibald - Gehlbach, Frederick R., - Webb, Sophie
    Type: Article
    In: The Wilson bulletin
    Volume: 107
    Issue: 3
    Date: 1995
    Page Range: 530--537
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  3. By: Howell, S N G - Webb, Sophie
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 112
    Date: 1992
    Page Range: 42--49
    Publication Info: London, British Ornithologists' Club, 1893-
  4. By: Howell, Steve N G - Webb, Sophie
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 115
    Date: 1995
    Page Range: 57--66
    Publication Info: London, British Ornithologists' Club, 1893-
  5. By: Howell, Steve N G - Webb, Sophie
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 115
    Date: 1995
    Page Range: 171--177
    Publication Info: London, British Ornithologists' Club, 1893-