He sells 3 books:
A Forbidden Tome - 1.5gp
The Crusade of 1312 A.G. - 3cp
Mixxy's Delicacies Vol 1. - 1.5gp
Mixxy's is, of course, a basic cookbook found many other places in Norrath. Contains recipes for such goodies as Edible Goo, Candied Spider, Rat Sandwich, Lion Steaks. All of which is amusing since you're not going to find these mobs on Kunark (but maybe it was provided for the iksar far away from home...).