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  1. By: Walter, Hartmut,‏ ‎
    Type: Article
    In: The journal of raptor research
    Volume: 31
    Issue: 4
    Date: 1997
    Page Range: 384--385
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Illinois. Dept. of Conservation. - Walter, Hartmut,‏ ‎
    Type: Article
    In: Revista chilena de historia natural
    Date: 2006-12-01
  3. By: Walter, Hartmut,‏ ‎
    Type: Article
    In: Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn
    Volume: 18
    Date: 1967
    Page Range: 216--220
    Publication Info: Bonn, Das Forschungsinstitut,