Percy Jackson and the Olympians: Ultimate Guide, The-Percy Jackson and the Olympians [With Trading Cards]Hardcover, 1 January 2010

It's the handbook no half-blood should be without: a fully illustrated, in-depth guide to gods, monsters, and all things Percy.
This novelty companion to the best-selling series comes complete with trading cards, full-color diagrams, and maps, all packaged in a handy, "manual-size" book with a crisp, magnetic flap enclosure.