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  1. By: Albers, Randy P - Gehlbach, Frederick R.,
    Type: Article
    In: The Wilson bulletin
    Volume: 102
    Issue: 2
    Date: 1990
    Page Range: 300--308
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Gehlbach, Frederick R.,
    Type: Article
    In: Proceedings of the United States National Museum
    Volume: 116
    Issue: 3505
    Date: 1965
    Page Range: 243--332
    Publication Info: Washington Smithsonian Institution Press, [etc.]
  3. By: Mccallum, D Archibald - Gehlbach, Frederick R., - Webb, Sophie
    Type: Article
    In: The Wilson bulletin
    Volume: 107
    Issue: 3
    Date: 1995
    Page Range: 530--537
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  4. By: Gehlbach, Frederick R.,
    Type: Article
    In: The journal of raptor research
    Volume: 28
    Issue: 3
    Date: 1994
    Page Range: 154--157
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  5. By: Gehlbach, Frederick R.,
    Type: Article
    In: The journal of raptor research
    Volume: 28
    Issue: 3
    Date: 1994
    Page Range: 125--126
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-