Bookshelves can be found whenever certain rooms are generated by the dungeon.
Bookshelves change in appearance & description as you descend deeper into the dungeon.
|Sewers||The bookshelf is packed with cheap useless books. Might it burn?|
|Prison||This is probably a vestige of a prison library. Might it burn?|
|Caves||Who would need a bookshelf in a cave?|
|Dwarven City||The[sic] rows of books on different disciplines fill the bookshelf.|
|Demon Halls||Books in ancient languages smoulder[sic] in the bookshelf.|
Bookshelves are found in certain room types: