This lot of 6 Beckett Baseball Price Guides features Mark McGwire as the main player, making it a valuable resource for collectors and fans. Published by Beckett Media in 1992, these original guides provide insights into the vintage baseball trading card market. With a focus on baseball, these paperback guides are essential for enthusiasts looking to learn more about the sport's memorabilia and collectibles. Made in the United States, these price guides offer a detailed analysis of Mark McGwire's cards and their value within the sports trading card industry.