1. The Bible (original languages and modern translations)
2. All of (English) Wikipedia
3. Medical textbooks
4. nand2tetris
5. Anything not already in Wikipedia about fabrication processes and manufacturing, especially the more "exotic" stuff - exactly how transistors work, photo-lithography, that kind of thing
I'm a little uncertain about the ordering of 4 and 5; building computer hardware is hard, but the mental models to use it are also unintuitive. On the other other hand, it only took us ~60 years to invent modern software the first time once we had the hardware, and Wikipedia hopefully already covered the mathematical background, so worst case we could probably reinvent everything else if we could preserve knowledge of how to fab transistors and simple microprocessors.
EDIT: I'm blanking on the name, but isn't there a set of textbooks that's basically "here's how to bootstrap a modern industrial civilization"? That seems tailor-made to this question, without needing to make people wander through wikipedia to stumble on little things like "levers" and "engines".