If you are going to buy only one casino chip guide book, then the book to buy is the Official U.S. Casino Chip Price Guide. The guide covers casino chips from Nevada, Atlantic City, NJ, Deadwood, ND, Colorado and Riverboats. It does not cover U.S. chips from card rooms, cruise ships, tribal casinos and Puerto Rico. The guide is currently in its 2nd edition and we hear that a third edition is in process. There are many other excellent casino chip guides, but they mainly cover only one particular location. I think I have just about every casino chip guide book published, because I collect $1 chips from all over.