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June 17,1926. Mr. John Roach, Deputy Commissioner of Labor, 571 Jersey Ave, Jersey City, N. J. Dear Mr. Roach: I am handing you enclosed, a copy of a paper prepared by Dr. Frederick B. Flinn of Columbia University, College of Physicians and Surgeonse You are doubtless acquainted with Dr. Flinn's work in industrial hygiene. The Doctor has been investigating and studying for months on the subject of so-called "Radium Necrosis" and I believe his paper will groatly interest you. Yours truly, President. ARoeder-HM Encl osure.