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January 16,1928. Dr. R. c. Williams, Assistant Surgeon Gen eral, Treasury Department, Bureau fo the Public Health Service, Washington, D.C. Dear Dr. Williams: This will acknowledge receipt of your letter of January 12th, giving further details as to the work conducted on the employees of the U/S.Bureau of Standards engaged in the handling of radium, together with a copy of your report. Your letter indicates that the data you have would probably contribute little to the knowledge which we already have in this field - however, we wish to thank you for your CO- operation in this matter, and if occasion demands our looking into the matter further we shall be glad to avail ourselves of the prävilege of examining your data on this subject. Very truly yours, Vice President. HHBarker :RH enclosure.