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  1. By: Hunter, P - Mahony, N A - Ewins, P J - Baird, D. - Field, M
    Type: Article
    In: The journal of raptor research
    Volume: 31
    Issue: 4
    Date: 1997
    Page Range: 321--326
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Ewins, P J
    Type: Article
    In: The journal of the Bombay Natural History Society
    Volume: 80
    Date: 1983
    Page Range: 413--414
    Publication Info: Bombay Bombay Natural History Society 1886-
  3. By: Ewins, P J
    Type: Article
    In: The journal of raptor research
    Volume: 31
    Issue: 2
    Date: 1997
    Page Range: 138--150
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  4. By: De Solla, S R - Martin, P A - Ewins, P J - Barker, Michael E.
    Type: Article
    In: The journal of raptor research
    Volume: 37
    Issue: 4
    Date: 2003
    Page Range: 307--314
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-