Campaign Sourcebook and Catacomb Guide (DMGR1), softback supplement for AD&D 2nd/2.5th ed.
“Whether you’re a novice DM getting ready to referee your first AD&D game or an old pro who’s running an established campaign, there’s something for you in the Campaign Sourcebook and Catacomb Guide. We’ve included dozens of helpful tips to help you better organize your games, design adventures, and make your NPCs come to life. In addition, we’ve included a number of settings for unusual dungeons. In short there’s something for everybody in this exciting addition to the AD&D system.”