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  1. By: Cuervo, Andrés M - Stiles, F Gary - Cadena, Carlos Daniel - Toro, Juan Lazaro - Londono, Gustavo A
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 123
    Date: 2003
    Page Range: 7--24
    Publication Info: London, British Ornithologists' Club, 1893-