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  1. By: Hellgren, Eric C - Vaughan, Michael R.
    Type: Article
    In: Brimleyana
    Volume: 21
    Date: 1994
    Page Range: 141--149
    Publication Info: [Raleigh, NC, North Carolina State Museum of Natural History], 1979-
  2. By: Kralovec, M L - Fuller, Mark R. - Schempf, Philip F. - Vaughan, Michael R.
    Type: Article
    In: The journal of raptor research
    Volume: 27
    Issue: 1
    Date: 1993
    Page Range: 76--76
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-