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  1. By: Hunter, P - Mahony, N A - Ewins, P J - Baird, D. - Field, M
    Type: Article
    In: The journal of raptor research
    Volume: 31
    Issue: 4
    Date: 1997
    Page Range: 321--326
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-