When the pandemic hit in early 2020, baseball's minor leagues cancelled their seasons. A few independent leagues tried abbreviated schedules, but all Major League affiliates shut down--for the first time in more than 120 years. Since then, Major League Baseball has taken over governance of the minors, and leagues and teams have been eliminated. In its fourth and final edition, this book gives a complete accounting of the minor leagues as they were known from the late 19th century through 2019.