It's a general collection of books from various worlds. There are a lot of history books (both general and more specific, like musical history or the history of Avalon), art books, and books on fae cultures. There appear to be some modern books as well, mostly best sellers and other things that are culturally impactful, but there seems to be a collection of books relating to the Kardashians as well (with a couple checked out). Arthurian legends are also available, though they are the real world versions so good luck parsing those because they all conflict each other and get real wild sometimes.