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  1. By: Kratter, Andrew W. - Sillett, T Scott - Chesser, Robert Terry, - O'neill, John P - Parker, Theodore A. - Castillo Urioste, Abel
    Type: Article
    In: The Wilson bulletin
    Volume: 105
    Issue: 1
    Date: 1993
    Page Range: 114--141
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Parker, Theodore A. - Castillo Urioste, Abel - Gell-Mann, Murray - Rocha O., Omar
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 111
    Date: 1991
    Page Range: 120--138
    Publication Info: London, British Ornithologists' Club, 1893-