Commemorative stamp collections have been issued yearly from 1971 by the U.S.P.S. The earliest sets are fairly simple booklets and become fancier as each year passed. Starting in the 1990's the book is more involved with info and color photos. In 1922 the book is a thicker hardback filled with color photos and a deeply researched background on each stamp issued. These are a great research tool for a particular year and a handsome gift. All stamps are mint, never hinged; as issued by the U.S.P.S. Buy one or collect all years!