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  1. By: Bowerman, William W. - Holt, J B
    Type: Article
    In: The journal of raptor research
    Volume: 25
    Issue: 3
    Date: 1991
    Page Range: 96--96
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Bowerman, William W. - Grubb, Teryl G - Bath, Alan J. - Giesy, John P. - Dawson, Gary A. - Ennnis, R. Kenneth
    Type: Article
    In: The Canadian field-naturalist
    Volume: 107
    Issue: 3
    Date: 1993
    Page Range: 273--278
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Grubb, Teryl G - Bowerman, William W. - Giesy, John P. - Dawson, Gary A.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 106
    Issue: 4
    Date: 1992
    Page Range: 443--453
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  4. By: Grubb, Teryl G - Bowerman, William W.
    Type: Article
    In: The journal of raptor research
    Volume: 31
    Issue: 3
    Date: 1997
    Page Range: 213--222
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-