If it's mid-nineties then it's one of the two ones marked Classic D&D Game. If it's earlier than it's the one with "New, Easy to Master Dungeons & Dragons Game" written on the cover which had slightly different contents but was still basically the same (which I forgot about until I re-checked).I voted Mentzer, but really it was a mid-90s reprint of the first 5 levels material of BECMI, in a boxed game format.
If it's mid-nineties then it's one of the two ones marked Classic D&D Game. If it's earlier than it's the one with "New, Easy to Master Dungeons & Dragons Game" written on the cover which had slightly different contents but was still basically the same (which I forgot about until I re-checked).
Hmm. That's odd. For some reason I can't see anything on that site. Like, it's literally a blank page everywhere. I can hover my mouse over the links which are there, and I can read the source just fine, but I can't see any of the content.