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  1. By: Peterson, A Townsend - Vieglais, David A - Siguenza, Adolfo G Navarro - Silva, Marcos
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 123A
    Date: 2003
    Page Range: 186--196
    Publication Info: London, British Ornithologists' Club, 1893-