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  1. By: Boyce, Douglas A. - Garrett, Ronald Lee - Walton, Brian James
    Type: Article
    In: Raptor research
    Volume: 20
    Issue: 2
    Date: 1986
    Page Range: 71--74
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  2. By: Morrison, Michael L. - Walton, Brian James
    Type: Article
    In: Raptor research
    Volume: 14
    Issue: 3
    Date: 1980
    Page Range: 79--85
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]