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  1. By: Powers, L R - Craig, Timothy H. - Martin, J
    Type: Article
    In: Raptor research
    Volume: 18
    Issue: 2
    Date: 1984
    Page Range: 78--79
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  2. By: Craig, Erica H. - Craig, Timothy H. - Powers, L R
    Type: Article
    In: Raptor research
    Volume: 20
    Issue: 2
    Date: 1986
    Page Range: 69--71
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  3. By: Powers, L R - Dale, Allen - Gaede, Peter A. - Rodes, C - Nelson, L - Dean, John J. - May, J D
    Type: Article
    In: The journal of raptor research
    Volume: 30
    Issue: 1
    Date: 1996
    Page Range: 15--20
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-