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  1. By: Berkelman, James, - Fraser, James D - Watson, Richard T.
    Type: Article
    In: The journal of raptor research
    Volume: 29
    Issue: 1
    Date: 1995
    Page Range: 53--53
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Berkelman, James, - Fraser, James D - Watson, Richard T.
    Type: Article
    In: The Wilson bulletin
    Volume: 111
    Issue: 1
    Date: 1999
    Page Range: 15--21
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  3. By: Berkelman, James, - Fraser, James D - Watson, Richard T.
    Type: Article
    In: The journal of raptor research
    Volume: 36
    Issue: 4
    Date: 2002
    Page Range: 287--293
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-