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4,660 Room 6306 -C of gotty Mass. Inst. of Technology Cambridge, Mass. Feb. 1, 1942 m C. Dr. Wallhausen United States Radium Corp. FEB 535 Pearl St., New York Dear Sir: Please send a 3/10 milligram ampoule of high grade radium salt which is supposed to be better than 90% pure, dissolved in distilled water. a $15.00 money order is enclosed. Very truly yours, C. W. Jacob See my

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