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  1. By: Hendricks, Paul - Swenson, J E
    Type: Article
    In: The Canadian field-naturalist
    Volume: 97
    Issue: 3
    Date: 1983
    Page Range: 307--310
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Swenson, J E
    Type: Article
    In: The Canadian field-naturalist
    Volume: 99
    Issue: 1
    Date: 1985
    Page Range: 40--46
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Swenson, J E - Hinz, T C - Knapp, Stephen J. - Wentland, Harold J. - Herbert, J T
    Type: Article
    In: Raptor research
    Volume: 15
    Issue: 4
    Date: 1981
    Page Range: 113--120
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]