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
Cthulhu Now: Modern Adventures and Background for Call of Cthulhu Roleplaying/3307, by Petersen,Okamoto, Jeff,Herber, Keith,Corless, Peter,Barton, William A.
Dead Reckonings (Call of Cthulhu Roleplaying Game), by Watts, Richard,Kingrea, J. Todd,Ross, Kevin
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
The Bermuda Triangle (Call of Cthulhu Horror Roleplaying, 1990s Era), by Justin Schmid