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  1. By: Watson, Richard T. - Thomsett, Simon - O'Daniel, Donna - Lewis, R
    Type: Article
    In: The journal of raptor research
    Volume: 30
    Issue: 1
    Date: 1996
    Page Range: 21--27
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: O'Daniel, Donna - Schneeweis, James
    Type: Article
    In: The Canadian field-naturalist
    Volume: 106
    Issue: 2
    Date: 1992
    Page Range: 268--268
    Publication Info: Ottawa Ottawa Field-Naturalists' Club