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  1. By: Martin, E M
    Type: Article
    In: The journal of raptor research
    Volume: 38
    Issue: 4
    Date: 2004
    Page Range: 312--319
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Martin, E M - Ruos, J L
    Type: Article
    In: Raptor research
    Volume: 10
    Issue: 3
    Date: 1976
    Page Range: 88--88
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]