d30 DM Companion. In trying to make the thing as meaty as possible, we trimmed some fluff, and expanded the meatier parts, but still had a page to fill. Since the Dungeon Crawl Worksheet was so well-received, it seemed only natural to create a Master Dungeon Mapping Key to accompany it (will appear as a single spread in the book). There's a couple of things I'd like to have added, but didn't seem to have space for (e.g., a "rope bridge" similar to the phanaton platforms from Isle of Dread.) I think the major bases are covered, though. More importantly, I don't think I've seen a key as comprehensive as this, with all the major architectural features, natural features, and furnishings.
To download a free PDF of this Master Dungeon Mapping Key from MediaFire, click here.