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  1. By: Hamilton, L L - Zwank, Phillip J., ‏ - Olsen, G. H.
    Type: Article
    In: The journal of raptor research
    Volume: 22
    Issue: 1
    Date: 1988
    Page Range: 22--26
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-