Sally Ride's personally owned letter from NASA, dated 29 September 1977, regarding her interview for selection into Astronaut Group 8. Addressed to Ride at Stanford University, letter reads in part, ''Subject: Interview for Astronaut Selection Program / This message confirms our telephone conversation concerning your application for the astronaut candidate program. / As we discussed, you are scheduled to be in Houston from...October 2, 1977, through...October 7, 1977...The medical evaluation will begin on Monday, October 3, 1977, at 7:00 a.m. with clinical laboratory tests...Please bring exercise clothes and rubber soled shoes suitable for running...'' Letter measures 8.5'' x 23.75''. Near fine condition. With an LOA from CMG Worldwide who represents the Sally Ride estate.