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  1. By: Parks, J E - Heck, W R - Hardaswick, V
    Type: Article
    In: Raptor research
    Volume: 20
    Issue: 1
    Date: 1986
    Page Range: 16--20
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  2. By: Parks, J E - Hardaswick, V
    Type: Article
    In: The journal of raptor research
    Volume: 21
    Issue: 2
    Date: 1987
    Page Range: 70--72
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-