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  1. By: Caton, Elaine L. - McClelland, B. Riley - Patterson, David A - Yates, Richard E
    Type: Article
    In: The Wilson bulletin
    Volume: 104
    Issue: 1
    Date: 1992
    Page Range: 136--142
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: McClelland, B. Riley - Mcclelland, Patricia T - Yates, Richard E - Caton, Elaine L. - Mcfadzen, M E
    Type: Article
    In: The journal of raptor research
    Volume: 30
    Issue: 2
    Date: 1996
    Page Range: 79--89
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-