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  1. By: Liversidge, Richard - Voelker, Gary
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 122
    Date: 2002
    Page Range: 93--109
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Voelker, Gary - Mcfarland, Sara L
    Type: Article
    In: The Wilson bulletin
    Volume: 114
    Issue: 2
    Date: 2002
    Page Range: 255--263
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-