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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Norris, Robert A - Williamson, Francis S. L.
    Type: Article
    In: The Wilson bulletin
    Volume: 67
    Issue: 2
    Date: 1955
    Page Range: 78--83
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Norris, Robert A - Connell, Clyde E - Johnston, David W
    Type: Article
    In: The Wilson bulletin
    Volume: 69
    Issue: 2
    Date: 1957
    Page Range: 155--163
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-