Each book is individually UV mapped and textured. You can customize book textures or use the books out of context as individual elements.
Photoshop format textures are included as an accompanying file download and include layers and the model's UV mesh as a hidden layer. Customizing the textures should be quite painless.
The Cinema 4D, VRML, Collada and Maya files all have correct pivot points for each book, and materials are kept intact. The OBJ file on the other hand, does retain model to material relationships, but the actual image files will need to be reloaded individually.