"Since 1946 the Guide Book of United States Coins has served collectors as the preeminent annual reference for coin specifications, mintages, values, and photographs. With more than 22 million copies in print, the Guide Book is well established as the hobby's most popular reference. The Professional Edition of the Guide Book of United States Coins builds on this foundation. This expanded and enlarged volume is intended for intermediate to advanced hobbyists, numismatic researchers, professional coin dealers and auctioneers, and investors. Its combination of more photographs, detailed higher-grade valuations, listings of additional varieties and rare early Proof coins, certified-coin population data, auction records, and other resources provides a wealth of information on every coin type ever made by the U.S. Mint. The Guide Book of United States Coins, Professional Edition, is your handy single-source guide to auction and certification trends, coin valuations, and other important aspects of the marketplace." Publisher's description.