If you enter an area with a book, your character will make a comment related to looking for books. Below are the locations.
Book 1 location
Book 2 location - this one was not visible on the map. You can still tab to it and use space to interact with it.
Book 3 location
Book 4 location
Book 5 location - this one was not visible on the map. You can still tab to it and use space to interact with it.