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  1. By: Mazur, K M - James, P C - Fitzsimmons, Michael J. - Langen, G - Espie, R H M
    Type: Article
    In: The journal of raptor research
    Volume: 31
    Issue: 3
    Date: 1997
    Page Range: 253--259
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-