Mine were mostly the early Avalon Hill, lifetime subscriptions to SPI S&T and Moves!, and some S&T non-subscription titles (War in the East, the Next War, etc.). Used to tinker with modifying AH Blitzkrieg and SPI Blitzkrieg Expansion Module to fix the air and naval rules and the map.
Never got the expansion module, but I still have my copies of War in Europe. I have quite a collection actually, but, it isn’t growing to much these days.
As I live on a sailboat, most of my stuff is in storage and only some of it is easily obtainable. If I ever get some shelving in there, it will be better.