Dungeons and Dragons Art and Arcana: A Visual History by Michael Witwer, Kyle Newman, Jon Peterson, and Sam Witwer

A history of D&D. Heavy emphasis on the visual elements.

Man, that early art was cheap and amateurish. Sometimes fun, to be sure. Picks up as it goes on. Also, there are maps, which gives me deep philosophical thoughts about the way dungeon crawls would be hard to make a novel out of. . . you would have to write a trilogy to cover every room in a single page.