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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Covert-Bratland, Kristin A - Theimer, Tad C - Block, William M.
    Type: Article
    In: The Wilson journal of ornithology
    Volume: 119
    Issue: 1
    Date: 2007
    Page Range: 43--52
    Publication Info: Lawrence, KS, Wilson Ornithological Society, 2006-