Rappan Athuk Expansions Volume I (Swords & Wizardry) (2015)

From publisher blurb:

Welcome to the ongoing adventures in my home-brew mega dungeon, Rappan Athuk. This is the first in a (hopefully) long series of additional materials that will be added to what may be, or certainly will become, the world’s largest mega-dungeon. I apologize in advance for the delay in the first installments, however I wanted to ensure that the new levels meshed well with the whole, and that continuity was not compromised.

This volume will feature a revised wilderness map, to detail placement of any new wilderness features and surface areas of interest.