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HARVARD UNIVERSITY School of Public Health Department of Physiology 55 Van Dyke Street Boston, Massachusetts April 17, 1924. Mr. A. Roeder, United States Radium Corporation, 30 Church Street, New York City. My dear Mr. Roeder: I enclose an account covering our work so far. I feel that it is better to render these promptly since it keeps you fairly aware of what we are up to. Very sincerely yours, Cecil K. Drinker Cecil K. Drinker, M.D.