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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Butler, Robert W. (Robert William), - Shepherd, Philippa C F - Lemon, Moira J F
    Type: Article
    In: The Wilson bulletin
    Volume: 114
    Issue: 4
    Date: 2002
    Page Range: 485--490
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-