Holt, Alan2018-07-262018-07-261983-06-25http://hdl.handle.net/2152.3/9593A United States Government Memorandum from Alan Holt to the STS-9 and STS-18 Crew Members regarding Flight Crew PreparationAlan HoltUnited States Government MemorandumSTS-9STS-18malfunctionsFlight Crew PreparationSpace MedicineDr. William Thornton