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  1. By: Hayes, F E - Goodman, Steven M. - Lopez, N E
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 110
    Date: 1990
    Page Range: 94--103
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Hayes, F E
    Type: Article
    In: The journal of raptor research
    Volume: 25
    Issue: 4
    Date: 1991
    Page Range: 101--108
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-