the foundational texts/histories of as many cultures and as many personal accounts of whatever pre-apocalypse was like, and some practical medical books.

I find it funny (but not surprising) that tech people will always put some random science knowledge in there but post-apocalyptic, small scattered communities aren't going to rely on computers and need, if anything, human knowledge which is always relevant and answers on how to govern themselves and how they ended up in the mess.

Basically whatever prevents Lord of the Flies and people dying of dysentery would I think have priority. Also gonna throw Ashley Book of Knots as a concrete recommendation in there because knowing your knots is probably a good idea when the world has ended and that book is a classic