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Room 6306- - C mass. Dnst. of Technology Cambridge, mass. January 20, 1942 Mr. C. W. Wallhausen United States Radium Corp. 535 Pearl street, new york Dear Sir: Can you supply about % milligrame of high grade radium salt of say 90% purity in water. Last may I bought from the United states Radium Corp. a $ 15.00 ampoule of radium.