Contact by Carl Sagan.
Zulu Heart by Steven Barnes.
Christy by Catherine Marshall.
A lot of books about the history of the Apollo-era space program, including astronaut biographies. Some of these are slowly becoming available; others show no sign. These include, sadly, the original text of Michael Collins' Carrying the Fire, which is hands down the best astronaut autobiography, and Andrew Chaikin's A Man on the Moon, which is probably the definitive popular history.
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