These books are intended to be used as environment props in a medium to close range.
There are 87 unique and original cover designs, all created by poly Havens community. The covers are also licensed as CC0.
On Poly Haven you find all the book covers. Author credits for each design can be seen by hovering over the thumbnails of them.
The customizable shader allows you to adjust the damage and age of each book independently. For this reason a GLTF version is not currently available.