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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Bock, Carl E., - Raphael, Martin - Bock, Jane H. (Jane Haskett),
    Type: Article
    In: The Wilson bulletin
    Volume: 90
    Issue: 1
    Date: 1978
    Page Range: 119--123
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-