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  1. By: Vasina, Wenceslao Guillermo - Straneck, R J
    Type: Article
    In: Raptor research
    Volume: 18
    Issue: 4
    Date: 1984
    Page Range: 123--130
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  2. By: Straneck, R J
    Type: Article
    In: Raptor research
    Volume: 16
    Issue: 1
    Date: 1982
    Page Range: 25--26
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]