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  1. By: Williamson, Francis S. L.
    Type: Article
    In: Journal of the Washington Academy of Sciences
    Volume: 62
    Date: 1972
    Page Range: 88--102
    Publication Info: Washington [etc Washington Academy of Sciences]
  2. By: Johnston, David W - Williamson, Francis S. L.
    Type: Article
    In: The Wilson bulletin
    Volume: 72
    Issue: 3
    Date: 1960
    Page Range: 248--252
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  3. 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-