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TREASURY DEPARTMENT UNITED STATES PUBLIC HEALTH SERVICE HUGH S. CUMMING, SURGEON GENERAL PRELIMINARY NOTE ON OBSERVATIONS MADE ON PHYSICAL CONDITION OF PERSONS ENGAGED IN MEASURING RADIUM PREPARATIONS BY R. C. WILLIAMS Passed Assistant Surgeon, Office of Industrial Hygiene and Sanitation United States Public Health Service REPRINT No. 889 FROM THE PUBLIC HEALTH REPORTS DECEMBER 21, 1923 (Pages 3007-3028) WASHINGTON GOVERNMENT PRINTING OFFICE 1924