Strangely enough, after a spate of Caves of Chaos references at the end of last year, I went for a hunt through my tiny garage. So I've read my 3rd edition copy of the D&D Basic Set and Dungeon Module B2 very recently.
Actually, I got it out for the blue rule book. At the back is a Sample Cross Section of the Great Stone Skull, The Pit, and the Domed City, and a map of the tunnels under Zenopus' Tower. I'm lovin' that style.