Scott Specialized Catalogue of United States Stamps & Covers

The 93rd edition of Scott Specialized Catalogue of United States Stamps and Covers continues its tradition of being the most extensively researched and in-depth reference on U.S. stamps.
Highlights among the long list of improvements and additions include:
A complete rework of the 1954-73 Liberty definitive series listings.
Dozens of new revenue listings in the Danish West Indies and the U.S. Virgin Islands.
New cancellation listings, starting with Scott number 12.
More than 7,800 value changes.
The addition of a large number of new postage errors.
Expanded listings for uncut press sheets.
Updated and revised census of registry labels.