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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Cody, Martin L - Sigel, Bryan J - Woltmann, Stefan - Kjeldsen, Jorgen Peter
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 127
    Date: 2007
    Page Range: 152--161
    Publication Info: London, British Ornithologists' Club, 1893-