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  1. By: Ellis, David H. (David Harry) - Whitlock, Peter L. - Tsengeg, P. - Nelson, R W
    Type: Article
    In: The journal of raptor research
    Volume: 33
    Issue: 2
    Date: 1999
    Page Range: 164--167
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Nelson, R W
    Type: Article
    In: Raptor research
    Volume: 7
    Issue: 3/4
    Date: 1973
    Page Range: 78--96
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  3. By: Nelson, R W
    Type: Article
    In: Raptor research
    Volume: 6
    Issue: 1
    Date: 1972
    Page Range: 11--15
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  4. By: White, Clayton M. - Nelson, R W
    Type: Article
    In: The journal of raptor research
    Volume: 25
    Issue: 3
    Date: 1991
    Page Range: 49--62
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-