The Bo Jackson/Cal Ripken Beckett Minor League Monthly Guide, April 1990 Issue #16 is a valuable resource for sports trading card collectors interested in baseball. Published by Beckett, this magazine features articles, insights, and information on players like Bo Jackson and Cal Ripken. With a focus on the sports and hobbies industry, this guide provides a deeper look into the baseball trading card market, making it a must-have for fans and collectors alike. Autograph authentication from Beckett adds an extra layer of authenticity to this sought-after publication.