- Atomic-Age Cthulhu: Mythos Horror in the 1950s
- World War Cthulhu: A Collection of Lovecraftian War Stories
- Doors to Darkness
- Secrets of San Francisco: A 1920s Sourcebook for the City By the Bay (Call of Cthulhu Roleplaying) (Call of Cthulhu Roleplaying)
- The Keeper's Companion: Blasphemous Knowledge, Forbidden Secrets, and Handy Information (Call of Cthulhu)