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February 21, 1946 Dr. F. B. Flinn, Columbia University, College of Physicians & Surgeons, 630 West 168th Street, New York, N. Y. Dear Dr. Flinn: I wish to acknowledge with thanks receipt of the collection of books which you recently sent to me. Though I have not as yet had an opportunity to make a study of the information in these books, I feel quite sure that at least one or two will be of considerable value to us in our present problema of the use of radium for the elimination of charges of static electricity. Very truly yours, Chief Chemist CWWallhausen:rkh