Warman's Coins And Paper Money: Identification and Price Guide
Allen Berman is a researcher and dealer of ancient, medieval, and modern coins. He's written numerous articles and books about coins and paper money, including three previous editions of the above title, as well as U.S. Coins & Currency, World Coins & Currency - both "Warman's" Companions, and "Warman's" U.S.Coins & Currency Field Guide.