Low poly and hand painted 5 different types of old books.
This is an example generated by geometry nodes, you can download the blend file containing the modifier, each individual book and the textures from this link:
https://drive.google.com/drive/folders/12PQ_57F2OrnlvTLIH2YGMTLIWZvGjK3r?usp=sharing
This is in no way a perfect generator, you might have to edit the position of vertices if there are clipping between the books. But overall, they are low poly and makes it easy to generate random books in shelves etc. Hope you like it!
Geometry Nodes