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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Atwood, N. Duane (Nephi Duane) - Pritchett, C L - Porter, R D - Wood, B W
    Type: Article
    In: The Great Basin naturalist
    Volume: 40
    Date: 1980
    Page Range: 303--350
    Publication Info: Provo, Utah, M.L. Bean Life Science Museum, Brigham Young University,
  2. By: Stone, C P - Porter, R D
    Type: Article
    In: Raptor research
    Volume: 13
    Issue: 2
    Date: 1979
    Page Range: 47--48
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]