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DIVISION OF AIR MAIL SERVICE finst Offire Department SECOND ASSISTANT POSTMASTER GENERAL JWS : :GJ Hashingtun March 21, 1929. Mr. H. H. Barker, Vice-President, United States Radium Corporation, 535 Pearl Street, New York, N. Y. My dear Sir: I have your letter of March 19 and will investigate and report to you as soon as practicable the reason for the delay to your air mail letter. Very truly yours, E. Eyes. B. Wad sworth, to Superintendent