Gary, I was leafing through the AD&D Descent into the Depths of the Earth modules, recently, and it occured to me to ask about the "Large Scale Map" included inside which briefly portrays maybe 4 times as many areas as actually are encountered in the adventure yourself.
I'm wondering: Did you draw this layout yourself, or was this content an addition by some other person (as I understand occasionally happened with some projects)? If you ever used this map, how much of the surrounding areas did you ever detail for your own purposes?