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April 20, 1943 Dr. F. B. Flinn, Columbia University, College of Physicians & Surgeons, De Lamar Institute of Public Health, 600 West 168th St., New York City Dear Dr. Flinn: We have received clearance through the Internal Security Office, Eastern Procurement District of the A.A.F. for the visit of your class of medical officers to our plant, covered in your letter of April 10th. We shall expect you at 2:00 P.M. on May 3rd, as requested. Very truly yours, President CBLee:rkh