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  1. By: Williamson, A A
    Type: Article
    In: Journal of the Washington Academy of Sciences.
    Volume: 44
    Date: 1954
    Page Range: 297--302
    Publication info: Washington [etc.,Washington Academy of Sciences]
  2. By: Williamson, A A
    Type: Article
    In: Journal of the Washington Academy of Sciences.
    Volume: 43
    Date: 1953
    Page Range: 305--311
    Publication info: Washington [etc.,Washington Academy of Sciences]