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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Schmutz, Josef K. (Josef Konrad), - Fyfe, Richard W. - Banasch, Ursula - Armbruster, Harry
    Type: Article
    In: The Wilson bulletin
    Volume: 103
    Issue: 1
    Date: 1991
    Page Range: 44--58
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-