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June 14, 1926. Dr . Frederick B. Flinn, Columbia University, College of Physicians and Surgeons, 437 West 59th St., New York City. Dear Dr. Flinn: I have a letter from Dr. William L. Clark of Philadelphiae There is one paragraph in which he refers to the X-Ray films that you want. I am quoting it below: "Replying to your letter of the 4th instant, I have directed that a collection of radiographs showing Pradium jaw necrosis" be sent to Dr. F. B. Flinn. I trust they will assist him in his studies." Yours truly, ARoeder-HM