In 1965 I was stationed in Glasgow AFB in northeast Montana. Straight out of Chicago, I was living in a three county area that had fewer people than the suburb of Evergreen Park. I went into the only drugstore in town and came across the St Louis Sporting News, which carried some coverage of both the major and minor leagues. For the first 6 months, the Tribune mailed me a free copy of the daily paper so I had news of the MLB club, but the Sporting News had news of their minor league teams.
Thus began a lifelong obsession with the Cubs minor league system.
It came out once a week. I believe it was dated Tuesdays, but it reached the stand on Wednesdays. They only got three copies, and I soon found out that if I didn't get there in the morning, they would all be gone.