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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Cooper, Joanne H. - Armitage, Philip L
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 133
    Issue: 1
    Date: 2013
    Page Range: 52--58
    Publication Info: London, British Ornithologists' Club, 1893-