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  1. By: Gerrard, Jonathan M. - Harmata, A R - Gerrard, P. Naomi
    Type: Article
    In: The journal of raptor research
    Volume: 26
    Issue: 4
    Date: 1992
    Page Range: 229--234
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Harmata, A R
    Type: Article
    In: Raptor research
    Volume: 16
    Issue: 4
    Date: 1982
    Page Range: 103--109
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]