This product is of incredible use to me as a DM. I enjoy the trope of the old wizard having a library and, due because of one of my player's being a librarian, I am always being asked what books are on the shelf. Previously I have stumbled through some improvisation regarding the contents that always felt half-baked.
Now, thanks to this document, I don't need to rely on my own wits for this all the time! I can quite easily roll up a handful of book titles to have ready to go.
[4 of 5 Stars!]