These are all real books, though the titles I picked aren’t meant to have any special significance. I’ve only read two of them. I tried to pick reasonably available books from the present day that would parallel the surviving Mayan books in content (there are only about this many). So we have books on astronomy, religion, mythology (sort of), and history. From these scant sources, could you reconstruct the sum of knowledge of our civilization? Probably not. It’s a good thing these aren’t, in fact, the only books left.