Armageddon 2419 AD, the original Buck Rogers story.
Alas, Babylon and Farnham's Freehold are good. I'd have to agree about 1632, also, although they're a different kind of oops! situation, the result is somewhat similar.
A Canticle For Liebowitz is another good read.
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"Blessed Saint Liebowitz, keep 'em dreaming down there" Astronaut Randy Claggett, Space, James Michener
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