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December 24, 1925. Dr. Frederick B. Flinn, e/o Columbia University, College of Physicians and Surgeons, 437 West 59th Street, New York City. Dear Dr. Flinn: I have received a letter from Dr. Harlan S. Miner, Chief Chemist of the Welsbach Company, Gloucester, N. J. The Welsbach Company makes Mesothorium which we buy. His enclosure will interest you so I am sending along the original letter complete. Yours truly, Prosi dent. ARoeder-HM Inclosures.