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  1. By: Zabel, Cynthia J., - Sakai, H. F. - Waters, J. R.
    Type: Article
    In: The journal of raptor research
    Volume: 27
    Issue: 1
    Date: 1993
    Page Range: 58--59
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Forsman, Eric D - Anthony, Robert G. - Meslow, E C - Zabel, Cynthia J.,
    Type: Article
    In: The journal of raptor research
    Volume: 38
    Issue: 3
    Date: 2004
    Page Range: 214--230
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-