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  1. By: Andersen, David E - Rongstad, Orrin J. - Mytton, William R.
    Type: Article
    In: Raptor research
    Volume: 20
    Issue: 2
    Date: 1986
    Page Range: 65--68
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  2. By: Lewis, Timothy L. - Rongstad, Orrin J.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 112
    Issue: 1
    Date: 1998
    Page Range: 75--81
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Andersen, David E - Rongstad, Orrin J.
    Type: Article
    In: The journal of raptor research
    Volume: 23
    Issue: 4
    Date: 1989
    Page Range: 152--156
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-