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April 24, 1940. Dr.Frederick B. Flinn, Columbia University, DeLamar Institute of Public Health, 600W. 168th St., New York City. Dear Dr. Flinn: As I pointed out to you at the time we propared the radio- active plates, the recovery of the radium would be inpractical. We have no use for the plates in their present form. There is a pos- sibility that we may be able to dispose of them some time in the future. If such an occasion arises, we will be glad to contact either you or the Borden Company. I regret that I cannot give you a more favorable report at the present time. Very truly yours, CWWallhausen:dk Chief Chemist