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  1. By: De Solla, S R - Martin, P A - Ewins, P J - Barker, M E
    Type: Article
    In: The journal of raptor research.
    Volume: 37
    Issue: 4
    Date: 2003
    Page Range: 307--314
    Publication info: Hastings, Minn. :Raptor Research Foundation,©1987-