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  1. By: Forsman, Eric D - Otto, I A - Sovern, S C - Taylor, Margaret - Hays, D W - Allen, Harriet. - Roberts, S L - Seaman, D E
    Type: Article
    In: The journal of raptor research
    Volume: 35
    Issue: 2
    Date: 2001
    Page Range: 141--150
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-