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  1. By: Duke, Gary E. - Jackson, Sue - Evanson, O A
    Type: Article
    In: The journal of raptor research
    Volume: 27
    Issue: 1
    Date: 1993
    Page Range: 39--41
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Duke, Gary E. - Evanson, O A - Chaplin, Susan B.,
    Type: Article
    In: The journal of raptor research
    Volume: 25
    Issue: 3
    Date: 1991
    Page Range: 90--91
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-