More than 11,000 value changes have been made in the 2010 edition of the Scott Specialized Catalogue of United States Stamps and Covers, with 5,800 of these changes being in the Postage section and more than 1,500 in the Revenue sections. The values for many classic rarities have increased, in many cases substantially. In the modern era, values are fairly steady, with occasional advances seen. Many plate blocks rise in value, and very modern plate blocks from panes of 100 with water-activated gum often have increased in value considerably. On the editorial side, nearly 2,500 illustrations have been replaced by new color scans in this yearís volume, more than 1,600 of them in the postage section alone. Click here for more information.