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U.S. DEPARTMENT OF LABOR SK:HD. BUREAU OF LABOR STATISTICS WASHINGTON April 29th, 192 9 APR 30 Mr. C. B. Lee, President, APR 301929 United States Radium Corporation, 535 Pearl Street, New York, N. Y. My dear Mr. Lee: On April 20 I sent you a letter concerning lemental contents of Undark luminous material. As I have not, so far heard from you, I fear the letter somehow went astray, and am consequently inclosing a copy of it for your consideration. Sincerely yours, S. Kjaer. 8. your Repr. U. S. Bureau of Labor Statistics.