Sander, Michael2018-08-022018-08-021983-03-26http://hdl.handle.net/2152.3/9686A congratulatory NASA letter to Dr. William Thornton on his selection as Mission specialist for the STS-51B SpaceLab #3 Mission.STS-51BSpaceLab #3Dr. William Thorntoncongratulatory letterNASASpace Medicine