The Official Blackbook Price Guide to United States Postage Stamps 2010, 32nd Editionis an easy-to-use sourcebook for collectors. Filled with the most current values and the latest market reports, this guide has all the information you need to become a knowledgeable stamp collector. Features include: Listings by Scott number for every stamp ever issued Thousands of illustrations for easy identification An updated market review that traces current trends in collecting and investing Exclusive prices for first day cover, mint sheets, plate blocks, line pairs, and PNCs Extensive information on buying, selling, and grading stamps at auctions, online, and through the mail