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  1. By: Herren, V - Anderson, Stanley H. - Ruggiero, L F
    Type: Article
    In: The journal of raptor research
    Volume: 30
    Issue: 3
    Date: 1996
    Page Range: 123--129
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Ruggiero, L F - Cheney, C D
    Type: Article
    In: Raptor research
    Volume: 13
    Issue: 2
    Date: 1979
    Page Range: 33--36
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  3. By: Squires, J R - Ruggiero, L F
    Type: Article
    In: The journal of raptor research
    Volume: 29
    Issue: 1
    Date: 1995
    Page Range: 45--45
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  4. By: Squires, J R - Ruggiero, L F
    Type: Article
    In: The journal of raptor research
    Volume: 29
    Issue: 1
    Date: 1995
    Page Range: 5--9
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-