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  1. By: Crocoll, S T - Parker, J W
    Type: Article
    In: The journal of raptor research
    Volume: 23
    Issue: 4
    Date: 1989
    Page Range: 125--139
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Parker, J W - Ports, M
    Type: Article
    In: Raptor research
    Volume: 16
    Issue: 1
    Date: 1982
    Page Range: 14--17
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  3. By: Parker, J W
    Type: Article
    In: The journal of raptor research
    Volume: 33
    Issue: 1
    Date: 1999
    Page Range: 63--66
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-