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  1. By: Yenning, F D
    Type: Article
    In: Journal of the Washington Academy of Sciences.
    Volume: 39
    Date: 1949
    Page Range: 383--9
    Publication info: Washington [etc.,Washington Academy of Sciences]
  2. By: Yenning, F D
    Type: Article
    In: Journal of the Washington Academy of Sciences.
    Volume: 44
    Date: 1954
    Page Range: 65--82
    Publication info: Washington [etc.,Washington Academy of Sciences]