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  1. By: Simmons, R E - Avery, D. M. - Avery, Graham M.
    Type: Article
    In: The journal of raptor research
    Volume: 25
    Issue: 3
    Date: 1991
    Page Range: 63--67
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Jenkins, A R - Avery, Graham M.
    Type: Article
    In: The journal of raptor research
    Volume: 33
    Issue: 3
    Date: 1999
    Page Range: 190--206
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  3. By: Avery, Graham M.
    Type: Article
    In: Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum
    Volume: 96
    Date: 1985
    Page Range: 55--65
    Publication Info: Cape Town, South African Museum, 1898-2004