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May 19, 1936. Dr. Robley D. Evans, file Massacibusetts Institute of Technology, Cambridge, Mass. Dear Dr. Evans: Thanka for the information contained in your letter of May 13th with reference to your sensitive gamne ray detector, and at such time as the reprints of your paper are available, I should appreciate having ons. Thanking you, I am, Very truly yours, HHBarker: DK Vice-President