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  1. By: Servheen, C - English, Walter
    Type: Article
    In: Raptor research
    Volume: 10
    Issue: 3
    Date: 1976
    Page Range: 84--87
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  2. By: Servheen, C - English, Walter
    Type: Article
    In: Raptor research
    Volume: 13
    Issue: 3
    Date: 1979
    Page Range: 79--88
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  3. By: Rose, E F - English, Walter - Hamilton, A
    Type: Article
    In: The journal of raptor research
    Volume: 27
    Issue: 1
    Date: 1993
    Page Range: 92--92
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-