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  1. By: Rosenfield, Robert N - Bielefeldt, John - Trexel, Dale R. - Doolittle, T C J
    Type: Article
    In: The journal of raptor research
    Volume: 32
    Issue: 3
    Date: 1998
    Page Range: 189--194
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Trexel, Dale R. - Rosenfield, Robert N - Bielefeldt, John - Jacobs, Eugene A
    Type: Article
    In: The Wilson bulletin
    Volume: 111
    Issue: 1
    Date: 1999
    Page Range: 7--14
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  3. By: Rosenfield, Robert N - Bielefeldt, John - Rosenfield, Laura J - Stewart, Andrew C - Murphy, Robert K - Grosshuesch, David A - Bozek, Michael A
    Type: Article
    In: The Wilson bulletin
    Volume: 115
    Issue: 3
    Date: 2003
    Page Range: 225--230
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  4. By: Bielefeldt, John - Rosenfield, Robert N - Cary, John R. (John Robert),
    Type: Article
    In: The Wilson bulletin
    Volume: 103
    Issue: 4
    Date: 1991
    Page Range: 656--660
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  5. By: Rosenfield, Robert N - Bielefeldt, John - Nolte, K R
    Type: Article
    In: The journal of raptor research
    Volume: 26
    Issue: 3
    Date: 1992
    Page Range: 189--191
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  6. By: Rosenfield, Robert N - Bielefeldt, John
    Type: Article
    In: The journal of raptor research
    Volume: 31
    Issue: 4
    Date: 1997
    Page Range: 313--316
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  7. By: Rosenfield, Robert N - Bielefeldt, John
    Type: Article
    In: The journal of raptor research
    Volume: 25
    Issue: 4
    Date: 1991
    Page Range: 113--115
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  8. By: Griggio, Matteo - Hamerstrom, Frances, - Rosenfield, Robert N - Tavecchia, Giacomo
    Type: Article
    In: The Wilson bulletin
    Volume: 114
    Issue: 4
    Date: 2002
    Page Range: 474--478
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-