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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-