The Standard Catalog of Baseball Cards is a core title for KP Books and has been for the previous 20 years. The book contains more than 1 million card values covering cards from 16,000 sets released from 1863-present. Each set is listed with a introduction explaining the set, unique features, size, etc., followed by three values for cards known to be included in the set. More than 10,000 photos accompany the text. This is the most comprehensive and respected baseball card price guide on the market, considered the "e;bible"e; of the hobby. For many collectors, this is an annual purchase, no questions.