Easy enough to find, the pile of rubble which used to be the Iwagakure Library is the pile of rubble which is half stone and half book. Luckily, despite the fact that the entire tower holding the library was demolished, most of the books and scrolls within the library still remained intact, with your few rare occasions where certain records may have been tattered to pieces. Given the nature of the attack however, large amounts of the books and scrolls survived, although completely buried in rubble without any discernible system which would allow you to find what you were looking for.
