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  1. By: Gawlik, Dale E - Rocque, Deborah A
    Type: Article
    In: The Wilson bulletin
    Volume: 110
    Issue: 1
    Date: 1998
    Page Range: 45--55
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Gawlik, Dale E
    Type: Article
    In: The journal of raptor research
    Volume: 26
    Issue: 3
    Date: 1992
    Page Range: 179--183
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  3. By: Gawlik, Dale E - Bildstein, Keith L. (Keith Louis),
    Type: Article
    In: The Wilson bulletin
    Volume: 102
    Issue: 1
    Date: 1990
    Page Range: 37--48
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-