Some bookshelves in action.
There are variants based on all wood types.
Crimson bookshelves
They can hold paper, maps and books when broken with a silk touch enchanted item
The inventory of 9 slots and the item tooltip.
Texture of a full bookshelf
Giacomo's bookshelf can be used as power source for enchantment table, but only if contains at least 3 books gives full power!