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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: Gerrard, Jonathan M. - Gerrard, P. Naomi - Whitfield, Douglas W. A.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 94
    Issue: 4
    Date: 1980
    Page Range: 391--397
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Gerrard, Jonathan M. - Harmata, A R - Gerrard, P. Naomi
    Type: Article
    In: The journal of raptor research
    Volume: 26
    Issue: 4
    Date: 1992
    Page Range: 229--234
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  4. By: Gerrard, Jonathan M. - Whitfield, Douglas W. A. - Gerrard, Peter - Gerrard, P. Naomi - Maher, William J
    Type: Article
    In: The Canadian field-naturalist
    Volume: 92
    Issue: 4
    Date: 1978
    Page Range: 375--382
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  5. By: Gerrard, P. Naomi - Wiemeyer, Stanley N. - Gerrard, Jonathan M.
    Type: Article
    In: Raptor research
    Volume: 13
    Issue: 2
    Date: 1979
    Page Range: 57--64
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]