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  1. By: Young, Kendal E., - Thompson, Bruce Carlyle, - Terrazas, Alberto Lafón - Montoya, A B - Valdez, Raul
    Type: Article
    In: The journal of raptor research
    Volume: 38
    Issue: 2
    Date: 2004
    Page Range: 107--117
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Young, Kendal E., - Zwank, Phillip J., ‏ - Valdez, Raul - Dye, J L - Tarango Arámbula, Luis Antonio
    Type: Article
    In: The journal of raptor research
    Volume: 31
    Issue: 4
    Date: 1997
    Page Range: 376--380
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-