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  1. By: Murphy, R K - Gratson, Michael W. - Rosefield, R N
    Type: Article
    In: The journal of raptor research
    Volume: 22
    Issue: 4
    Date: 1988
    Page Range: 97--100
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Gratson, Michael W. - Toepfer, John E. - Anderson, Raymond K
    Type: Article
    In: The Canadian field-naturalist
    Volume: 104
    Issue: 4
    Date: 1990
    Page Range: 561--566
    Publication Info: Ottawa Ottawa Field-Naturalists' Club