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  1. By: Ellis, David H. (David Harry) - Woffinden, Neil D. - Whitlock, Peter L. - Tsengeg, P.
    Type: Article
    In: The journal of raptor research
    Volume: 33
    Issue: 4
    Date: 1999
    Page Range: 323--326
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. 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-