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  1. By: Wright, A. L. (Anthony L.), - Hayward, G D
    Type: Article
    In: The journal of raptor research
    Volume: 32
    Issue: 2
    Date: 1998
    Page Range: 77--81
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Hayward, G D
    Type: Article
    In: The journal of raptor research
    Volume: 21
    Issue: 3
    Date: 1987
    Page Range: 98--102
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  3. By: Hayward, G D
    Type: Article
    In: The journal of raptor research
    Volume: 31
    Issue: 2
    Date: 1997
    Page Range: 114--124
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-