I'm sorry if this is a stupid question and I've missed some obvious information somewhere, but I'm just wondering if the skill increases from books are limited the same as in Skyrim where after you've read a book once you won't gain a skill level the next time you see it and there is only a small number of books that enhance each skill available? (like 5 for each skill, or whatever) I'm guessing this is the case, but I just wanted to verify it.
I'm wondering because I recall in Skyrim it was best to hold off reading books until later because getting a free level in a skill later on was a much better deal than getting it right away. And I'm wondering if it's worth continuing to check bookshelves after a while.... are you likely to find all of them pretty early on if you start out activating every bookshelf? Or is one of each distributed in each zone or something? Anyways, just curious.