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April 3rd, 1929. Dr. James E. Ives, Treasury Department, Public Health Service, Room 1-123 Bldg., 16th Seventh St., S.W., Washington, D. C. Dear Dr. Ives: Your letter of April lst, enclosing circular of the Bureau of Standards on X-ray and Radium protection has come to hand. Please accept my thanks for your courtesy in this matter. Ve ry truly yours, Vice President. HHBarker* RH