That isn’t a rule book or prepackaged adventure module. It isn’t even character sheets. It is the cover for “adventure record sheets”, forms used to keep track of what happened during a dungeon crawl. You could just do that on a blank piece of paper.
This is how I spent my disposable income before I was old enough to own firearms. Nowadays I just buy a few boxes of ammo and turn my money into noise down at the range.
I was never a TSR fan, but I recall the days when some systems could publish anything – and my money would be heading there even before the ink was dry.
“You could just do that on a blank piece of paper.”
Blank? You were forced to draw your own squares/hexes on it?
What sort of savage wilderness did you grow up in?? 😛