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  1. By: Yenning, Frank 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, Frank 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]