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  1. By: Sheffield, S R
    Type: Article
    In: The journal of raptor research
    Volume: 28
    Issue: 2
    Date: 1994
    Page Range: 119--120
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Sheffield, S R - Jobe, Noble,
    Type: Article
    In: The journal of raptor research
    Volume: 30
    Issue: 1
    Date: 1996
    Page Range: 43--44
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  3. By: Sheffield, S R - Howery, M
    Type: Article
    In: The journal of raptor research
    Volume: 35
    Issue: 4
    Date: 2001
    Page Range: 351--356
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-