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  1. By: Brown, Bryan T. - Mesta, R - Stevens, L E - Weisheit, John S.
    Type: Article
    In: The journal of raptor research
    Volume: 23
    Issue: 3
    Date: 1989
    Page Range: 110--113
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Brown, Bryan T. - Stevens, L E
    Type: Article
    In: The journal of raptor research
    Volume: 31
    Issue: 1
    Date: 1997
    Page Range: 7--10
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-