What are the other guides besides these that he has kept available?

I saw System 80 mentioned. Were there others?

Atari seems impossible to find.

But generally you don’t need an entire guide when you are working on something. I’d rather have them all available sitting there digitally on a hard drive taking up no space, then print a few needed pages on demand for a project. That way you can also scribble notes on them as you go along, then toss them when that job is done.