Dick, Philip K. 1964 . The Penultimate Truth. Mariner Books.
This book is a great time travel book. It is not about time travel, but reading it is a good way to travel back in time to the era of the cold war and the related paranoia. It is also a book about the power of information, and control over information in closed (in this case, literally) societies. It can also be enjoyed on the level of technical prediction. Dick is too optimistic about developments in mechanical engineering but way underestimates developments in information technology.
Good stuff, and recommended if you like science fiction about ideas.
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