Not much to say about this, the cover tells it all, this is a compilation of three previous Dungeon Geomorphs, modular maps that DMs could use to build random dungeons. The most interesting thing here is the cover that clearly shows how D&D (as opposed to AD&D) is aimed at younger players, with this being one of the first times that a pre-pubescent kid is shown as the DM for the game, this shows something that will increase towards the 80s, aiming towards a younger audience with things like the animated series and coloring books etc.