9 books • 1 series
The Game Master's Book of Legendary Locations (The Game Master)
The Game Master's Book of Instant Towns and Cities (The Game Master)
The Game Master's Book of More Random Encounters (The Game Master)
Everything I Need to Know I Learned from RPGs
The Game Master's Box of Unlimited Adventure
The Unofficial Yellowstone Puzzles Collection
The Game Master's Book of Traps, Puzzles and Dungeons
The Game Master's Book of Non-Player Characters
The Game Master's Book of Random Encounters