How Pro Baseball Works: Mapping the Minor Leagues by Todd Traub Posted 12/17/2012 12:00 am Since 1963, when minor league baseball organized into the structure under which it operates today, clubs have developed players almost exclusively for major league teams. Want the Full Article? Get Unlimited Archive Access for $19.95 per Year Readers must pay to access stories older than 20 days. Purchase Now Already have archive access? Login to view this article.