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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Butchart, Stuart - Stattersfield, A J - Brooks, Thomas (Thomas M.)
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 126A
    Date: 2006-06-05
    Page Range: 7--24
    Publication Info: London, British Ornithologists' Club, 1893-