Arkham Unveiled: Adventures and Background in the Home of Miskatonic University (Call of Cthulhu), by Morrison, Mark, Watts, Richard, Herber, Keith
Petersen's Field Guide to Cthulhu Monsters: A Field Observer's Handbook of Preternatural Entities (Call of Cthulhu), by Sandy Petersen
1990's Handbook: Modern Background for Call of Cthulhu, by greg-rucka
Secrets of Japan (Call of Cthulhu Horror Roleplaying, Modern Era), by Michael Dziesinski
The Thing at the Threshold (Call of Cthulhu), by Paul McConnell
Call of Cthulhu (d20 Edition Horror Roleplaying, WotC), by Monte Cook, John Tynes
The Golden Dawn (Call of Cthulhu), by Tynes, John,Smithee, Alan,Hatherly, Steve,Aniolowski, Scott
Call of Cthulhu Gamemasters Pack: d20, Horror Roleplaying, 8801, by Dustin Wright,Aaron Rosenberg
Investigator's Companion vol. 2 (Call of Cthulhu Horror Roleplaying, 1920s, #2346), by Herber, Keith, Ross, Kevin A., Rucka, Greg, O'Connell, Gary
The Bermuda Triangle (Call of Cthulhu Horror Roleplaying, 1990s Era), by Justin Schmid
Call of Cthulhu: Fantasy roleplaying in the worlds of H.P. Lovecraft, by Petersen, Sandy
S. Petersen's Field Guide to Creatures of the Dreamlands (Call of Cthulhu Horror Roleplaying), by Lynn Willis,Sandy Petersen
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