A Guide Book of United States Coins (The Official Red Book), first compiled by R. S. Yeoman in 1946, is a price guide for coin collectors of coins of the United States dollar, commonly known as the Red Book. Along with its sister publication, the older Handbook of United States Coins (The Official Blue Book), it is considered an authoritative U.S. coin price guide. The Guide Book and Handbook got their nicknames (and now official trademarks), the "Red Book" and the "Blue Book," due to their respective solid red and blue covers. Both books are published annually, dated for the following year.