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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Dowsett, Robert J - Aspinwall, D. R. - Leonard, Peter
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 119
    Date: 1999
    Page Range: 94--103
    Publication Info: London, British Ornithologists' Club, 1893-