It’s incredible how many card collectors catalogs there were in the early 90s.
If you’re a hobby library collector, what’s funny is that despite massive distributions at the time, most of these don’t come up for sale very often (but they’re not much more expensive than a few dollars when they do). I hadn’t even heard of a few of these.
Also, things aren’t that different today. If we were to try to categorize the number of marketplaces that exist today, it would be pretty huge, too. Just think how many Facebook groups there are for sales alone.
PS, this ad is a scan from the April 1992 edition of Allan Kaye’s Sports Cards News & Price Guides.