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  1. By: Beier, Paul.
    Type: Article
    In: The journal of raptor research
    Volume: 29
    Issue: 1
    Date: 1995
    Page Range: 41--41
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Boyce, Douglas A. - Kennedy, Patricia L - Beier, Paul. - Ingraldi, Michael F - Macvean, S R - Siders, M S - Squires, J R - Woodbridge, Brian
    Type: Article
    In: The journal of raptor research
    Volume: 39
    Issue: 3
    Date: 2005
    Page Range: 296--302
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  3. By: Trapp, Jon R. - Beier, Paul. - Mack, Curtis M. - Parsons, David R. - Paquet, Paul C.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 122
    Issue: 1
    Date: 2008-01-01
    Page Range: 49--56
    Publication Info: Ottawa Ottawa Field-Naturalists' Club