The PSA Population Report is a valuable research tool for collectors of all ages. Every card that PSA has graded and encapsulated to date is featured in this comprehensive guide. As the leading sportscard grading service in the world, PSA has graded over 3 million sportscards with many of the examples being the finest known to date. After a grade is assigned by the PSA experts, a certification number is given to each card. After that number is assigned, the cards are then entered into the PSA Population Report. With record prices being paid for PSA graded cards, it is important that collectors know where each sportscard ranks in the PSA Population Report. Do you have one of the finest known Mickey Mantles in existence? Is the 1948 Leaf Satchel Paige that rare in high-grade? How tough is the 1993 SP Derek Jeter in PSA "10" Gem Mint? The PSA Population Report can help answer these important questions. You can search for population numbers by sport and year or by player name. As an active collector in today's market, you need to arm yourself with as much information as possible. The PSA Population Report is a vital reference for all collectors.