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  1. By: Krabbe, Niels - Poulsen, Bent Otto - Frolander, Amy - Rodríguez Barahona, Orfa
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 117
    Date: 1997
    Page Range: 248--256
    Publication Info: London, British Ornithologists' Club, 1893-