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  1. By: Hoffman, Wayne - Woolfenden, Glen Everett, - Smith, P William
    Type: Article
    In: The Wilson bulletin
    Volume: 111
    Issue: 3
    Date: 1999
    Page Range: 303--313
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Smith, P William
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 121
    Date: 2001
    Page Range: 249--252
    Publication Info: London, British Ornithologists' Club, 1893-
  3. By: Smith, P William
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 117
    Date: 1997
    Page Range: 264--271
    Publication Info: London, British Ornithologists' Club, 1893-