The new 28th edition ofThe OfficialBlackbook Price Guide to United States Postage Stampsis updated to give you the current value of every U.S. postage stamp along with its illustration on every page. This in-depth source makes it easy to identify and price the collection you own and the stamps you want to buy. This isthemost comprehensive pocket stamp guide available, with information on collecting and investing and how to buy, sell, and grade stamps. With complete listings of stamp publications and organizations, this is your passport to the stamp-collecting community. Special Features: Scott numbers for all possible varieties appear with each stamp illustration An up-to-date market review that traces current trends in stamp collecting and investing Exclusive prices for first day cover, mint sheets, plate blocks, line pairs, and PNCs Essential information on how to identify types