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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Mann, C F - Burton, P. J. K. (Philip John Kennedy), - Lennerstedt, I
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 98
    Date: 1978
    Page Range: 131--140
    Publication Info: London, British Ornithologists' Club, 1893-