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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hedenstrom, A - Bensch, Staffan, - Hasselquist, D - Ottosson, Ulf
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 110
    Date: 1990
    Page Range: 194--197
    Publication Info: London, British Ornithologists' Club, 1893-