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May 20,1941. Mr. C. W. Jacob, Massachusetts Institute of Technology, Cambridge, Mass. Room 6306-C Dear Sir: In reply to your letter of May 14th, we wish to advise that we are not in a position to supply any polonium, and the smallest tubes of high grade radium salt which we have available at present contain from 8/10 to 9/10 milligram activity. The price of this material in smallest quantity is $70.00 per milligram. We do, however, carry on hand a solution of high grade radium salt in distilled water, and would be glad to furnish you with an ampoule containing 3/10 milligram if you can use the material in this form. This is also a salt of approximately 95% purity, and the price for 3/10 milligran would be $15.00. Very truly yours, Chief Chemist