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  1. By: Craighead, Frank C., (Frank Cooper), - Dunstan, T C
    Type: Article
    In: Raptor research
    Volume: 10
    Issue: 4
    Date: 1976
    Page Range: 112--119
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  2. By: Dunstan, T C - Harrell, B E
    Type: Article
    In: Raptor research
    Volume: 7
    Issue: 2
    Date: 1973
    Page Range: 49--54
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]