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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Adams, M. P. - Cooper, Joanne H. - Collar, Nigel J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 123A
    Date: 2003
    Page Range: 338--354
    Publication Info: London, British Ornithologists' Club, 1893-