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  1. By: Ault, Steven J
    Type: Article
    In: Raptor research
    Volume: 18
    Issue: 2
    Date: 1984
    Page Range: 62--66
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  2. By: Ault, Steven J - House, E W
    Type: Article
    In: The journal of raptor research
    Volume: 21
    Issue: 4
    Date: 1987
    Page Range: 147--152
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-