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  1. By: Negro, J J - De la Riva, Manuel Jesús - Hiraldo, F
    Type: Article
    In: The journal of raptor research
    Volume: 24
    Issue: 3
    Date: 1990
    Page Range: 72--74
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Negro, J J - De la Riva, Manuel Jesús - Bustamante, Javier
    Type: Article
    In: The journal of raptor research
    Volume: 25
    Issue: 2
    Date: 1991
    Page Range: 30--35
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-