This page lists the books found in Caves of Qud.

Books are a type of item.  Some of them are randomly generated, such as the Frivolous Lives books, but others appear in fixed locations, like The Canticles Chromatic Verses XVII-XXVI, which the zealot in Joppa always has. Randomly generated books have a white title, but prefab books have a yellow title.

They provide no advantage in combat or exploration, containing nothing but lore. They are still useful as trade goods, having a low weight and high value or alternatively you gift them to Sheba Hagadias at the Six Day Stilt for some insightful commentary (Experience points).   Additionally, there are some randomly-generated books found on places like the bookshelf in Barathrum the Old's study.