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  1. By: Hofslund, P B
    Type: Article
    In: The Wilson bulletin
    Volume: 78
    Issue: 1
    Date: 1966
    Page Range: 79--87
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Hofslund, P B
    Type: Article
    In: Raptor research
    Volume: 7
    Issue: 3/4
    Date: 1973
    Page Range: 107--108
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]