Yeah, I'm not denying we need the philosophy/history books

But civilization would need to bootstrap to "current levels" quickly, and I assume a lot of knowledge about that is currently only in people's heads

Crops + Animal Raising -> food. Then construction and metallurgy (helps with the first items), then thermal machines, then industry building all over again. Then to electronics, semiconductors up to computers again. Don't forget all the medicine, chemistry, plastics, oil processing there as well