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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Gjershaug, Jan Ove, - Forset, Ole Andreas - Woldvik, Kjell - Espmark, Yngve
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 126
    Date: 2006
    Page Range: 73--80
    Publication Info: London, British Ornithologists' Club, 1893-