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