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 Thing at the Threshold (Call of Cthulhu), by Paul McConnell
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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