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TREASURY DEPARTMENT UNITED STATES PUBLIC HEALTH SERVICE OFFICE OF PPR 3 1929 INDUSTRIAL HYGIENE WASHINGTON, D. C. AND SANITATION Room 1-123, "C" Bldg. 16 Seventh st., , S. W. April 1, 1929 Mr. H. H. Barker, United States Radium Corporation, 535 Pearl St., New York, N. Y. Dear Mr. Barker: I find I have some extra copies of the circular of the Bureau of Standards on "X-ray and Radium Protec- tion", of which I spoke to you. I am therefore enclosing to you a copy. With kind regards, Yours sincerely, James E Eves (James E. Ives)