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  1. By: Barton, Nigel W. H. - Houston, D C
    Type: Article
    In: The journal of raptor research
    Volume: 30
    Issue: 4
    Date: 1996
    Page Range: 219--223
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Barton, Nigel W. H. - Houston, D C
    Type: Article
    In: The journal of raptor research
    Volume: 35
    Issue: 1
    Date: 2001
    Page Range: 71--73
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  3. By: Barton, Nigel W. H.
    Type: Article
    In: The journal of raptor research
    Volume: 34
    Issue: 1
    Date: 2000
    Page Range: 53--55
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  4. By: Barton, Nigel W. H. - Fox, Nicholas C. - Surai, P F - Speake, B K
    Type: Article
    In: The journal of raptor research
    Volume: 36
    Issue: 1
    Date: 2002
    Page Range: 33--38
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-