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  1. By: Yahner, Richard H. (Richard Howard) - Rohrbaugh, R W
    Type: Article
    In: The journal of raptor research
    Volume: 32
    Issue: 2
    Date: 1998
    Page Range: 178--180
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Rohrbaugh, R W - Yahner, Richard H. (Richard Howard)
    Type: Article
    In: The journal of raptor research
    Volume: 27
    Issue: 1
    Date: 1993
    Page Range: 80--80
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-