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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: Mytton, William R. - Keith, Lloyd B.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 95
    Issue: 1
    Date: 1981
    Page Range: 39--49
    Publication Info: Ottawa Ottawa Field-Naturalists' Club