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  1. By: Gerhardt, Richard P - González, Normandy Bonilla - Gerhardt, Dawn Mcannis - Flatten, Craig J
    Type: Article
    In: The Wilson bulletin
    Volume: 106
    Issue: 4
    Date: 1994
    Page Range: 629--639
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Seavy, Nathaniel E - Gerhardt, Richard P
    Type: Article
    In: The journal of raptor research
    Volume: 32
    Issue: 2
    Date: 1998
    Page Range: 175--177
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  3. By: Gerhardt, Richard P - Gerhardt, Dawn M - Vasquez, Miguel Angel
    Type: Article
    In: The Wilson bulletin
    Volume: 109
    Issue: 1
    Date: 1997
    Page Range: 112--120
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-