Random Wizard: Gygax's CastleGreyhawk vs TSR's Geomorphs.

Random Wizard notes the similarity in the style of Gygax's Castle Greyhawk to TSR's Geomorphs.

Original Link:
http://randomwizard.blogspot.com/2013/10/castle-greyhawk-caverns.html

Now at:
https://www.kirith.com/random-wizard/articles/castle-greyhawk-caverns.html