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  1. By: Robel, Robert J - Keating, Jeffrey F - Zimmerman, John L - Behnke, Keith C - Kemp, Kenneth E
    Type: Article
    In: The Wilson bulletin
    Volume: 109
    Issue: 2
    Date: 1997
    Page Range: 218--225
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-