2018-01-302018-01-30Unknownhttp://hdl.handle.net/2152.3/5056This image reflects a handwritten letter from William Thornton, addressed to George Hoff and Joe Kerwin, regarding the purchase of an inflight treadmill.handwritten letterWilliam E. ThorntonTreadmillresearchExerciseSpace MedicineJoe KerwinGeorge Hoff