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  1. Hybridisation between Common Buzzard Buteo buteo and Rough-legged Buzzard B-lagopus in Norway
    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
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