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  1. By: Gerrard, Jonathan M. - Gerrard, P. Naomi - Bortolotti, Gary R. (Gary Roy), - Dzus, E H
    Type: Article
    In: The journal of raptor research
    Volume: 26
    Issue: 3
    Date: 1992
    Page Range: 159--166
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Miller, M J R - Wayland, Mark - Dzus, E H - Bortolotti, Gary R. (Gary Roy),
    Type: Article
    In: The journal of raptor research
    Volume: 34
    Issue: 3
    Date: 2000
    Page Range: 167--174
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  3. By: Bortolotti, Gary R. (Gary Roy), - Dzus, E H - Gerrard, Jonathan M.
    Type: Article
    In: The journal of raptor research
    Volume: 22
    Issue: 2
    Date: 1988
    Page Range: 66--67
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  4. By: Dawson, Russell D. - Whitworth, Terry L. - Bortolotti, Gary R. (Gary Roy),
    Type: Article
    In: The Canadian field-naturalist
    Volume: 113
    Issue: 3
    Date: 1999
    Page Range: 503--506
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  5. By: Bortolotti, Gary R. (Gary Roy),
    Type: Article
    In: The journal of raptor research
    Volume: 28
    Issue: 3
    Date: 1994
    Page Range: 127--133
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  6. By: Bortolotti, Gary R. (Gary Roy),
    Type: Article
    In: The journal of raptor research
    Volume: 26
    Issue: 2
    Date: 1992
    Page Range: 100--100
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  7. By: Murza, G L - Bortolotti, Gary R. (Gary Roy), - Dawson, Russell D.
    Type: Article
    In: The journal of raptor research
    Volume: 34
    Issue: 2
    Date: 2000
    Page Range: 137--142
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  8. By: Dawson, Russell D - Bortolotti, Gary R. (Gary Roy),
    Type: Article
    In: The Wilson bulletin
    Volume: 109
    Issue: 4
    Date: 1997
    Page Range: 732--734
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  9. By: Bortolotti, Gary R. (Gary Roy),
    Type: Article
    In: The Wilson bulletin
    Volume: 96
    Issue: 4
    Date: 1984
    Page Range: 524--542
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  10. By: Bortolotti, Gary R. (Gary Roy), - Barlow, Jon C. (Jon Charles),
    Type: Article
    In: The Wilson bulletin
    Volume: 98
    Issue: 4
    Date: 1986
    Page Range: 516--525
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  11. By: Bortolotti, Gary R. (Gary Roy), - Wiebe, Karen L. (Karen Lorelle),
    Type: Article
    In: The journal of raptor research
    Volume: 27
    Issue: 1
    Date: 1993
    Page Range: 47--49
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  12. By: Wiebe, Karen L. (Karen Lorelle), - Bortolotti, Gary R. (Gary Roy),
    Type: Article
    In: The Wilson bulletin
    Volume: 114
    Issue: 3
    Date: 2002
    Page Range: 393--400
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-