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  1. By: Lowther, Peter E
    Type: Article
    In: The Wilson bulletin
    Volume: 87
    Issue: 4
    Date: 1975
    Page Range: 481--495
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Lowther, Peter E - Fraga, Rosendo M - Schulenberg, T S - Lanyon, S M
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 124
    Date: 2004
    Page Range: 171--177
    Publication Info: London, British Ornithologists' Club, 1893-