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  1. By: Bates, John M. (John Mark), - Garvin, Mary Catherine - Schmitt, Donna C. - Schmitt, C. Gregory
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 109
    Date: 1989
    Page Range: 236--247
    Publication Info: London, British Ornithologists' Club, 1893-