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  1. By: Howell, Steve N G - Dowell, Barbara A - James, Douglas A - Behrstock, Robert A - Robbins, Chandler S.
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 112
    Date: 1992
    Page Range: 235--244
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Marshall, Joe T. (Joe Truesdell) - Behrstock, Robert A - König, Claus
    Type: Article
    In: The Wilson bulletin
    Volume: 103
    Issue: 2
    Date: 1991
    Page Range: 311--314
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-