: Covers countries from G to I (e.g., Germany, Great Britain, Italy).

: Covers countries from J to O (e.g., Japan, Mexico).

The is a multi-volume reference set essential for stamp collectors, providing definitive identification numbers and market values for nearly every stamp issued worldwide. Released in 2006, this edition consists of six primary volumes organized alphabetically by country. Catalogue Overview and Structure

: Covers the United States, United Nations, and countries from A to B (e.g., Australia, Brazil).

: Covers countries from P to Sl (e.g., Philippines, Russia).

: Covers countries from So to Z (e.g., Spain, Vietnam).

: Covers countries from C to F (e.g., Canada, China, France).