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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Bock, Carl E., - Hadow, Harlo H - Somers, Preston
    Type: Article
    In: The Wilson bulletin
    Volume: 83
    Issue: 3
    Date: 1971
    Page Range: 237--248
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-