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  1. By: Howard, R P - Hilliard, M
    Type: Article
    In: Raptor research
    Volume: 14
    Issue: 2
    Date: 1980
    Page Range: 41--45
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  2. By: Howard, R P - Wilson, Lanny O. - Renn, F B
    Type: Article
    In: Raptor research
    Volume: 10
    Issue: 4
    Date: 1976
    Page Range: 120--128
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]