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  1. By: Schmutz, S M - Schmutz, Josef K. (Josef Konrad),
    Type: Article
    In: Raptor research
    Volume: 9
    Issue: 3/4
    Date: 1975
    Page Range: 58--59
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  2. By: Gerrard, N - Schmutz, S M
    Type: Article
    In: The journal of raptor research
    Volume: 26
    Issue: 3
    Date: 1992
    Page Range: 198--199
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-