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  1. By: Bennett, Richard S. Jr. - Klaas, E E
    Type: Article
    In: Raptor research
    Volume: 20
    Issue: 2
    Date: 1986
    Page Range: 75--76
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  2. By: Parris, S D - Klaas, E E - Wilson, Ruth A.
    Type: Article
    In: Raptor research
    Volume: 14
    Issue: 3
    Date: 1980
    Page Range: 88--89
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  3. By: Varland, Daniel E. - Klaas, E E - Loughin, Thomas M
    Type: Article
    In: The journal of raptor research
    Volume: 25
    Issue: 1
    Date: 1991
    Page Range: 9--17
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-