6 books in series
L'Appel de Cthulhu
L'Appel de Cthulhu is a 6-book series with 6 primary works first released in 1981 with contributions by Sandy Petersen, Lynn Willis, Dennis Detwiller, Adam Scott Glancy, John Tynes, Yurek Chodak, Tadashi Ehara, Harry Henderson, Charlie Krank, Steve Perrin, Greg Stafford, Anders Swenson, and Inc Staff Chaosium.
 Delta Green: Eyes Only
| 5 | 2 reads | |||
 Delta Green Delta Green
| 4.5 | 3 reads | |||
 Call of Cthulhu Call of Cthulhu: Horror Roleplaying
| 4 | 6 reads | |||
 Delta Green Delta Green: Countdown
| 4 | 2 reads | |||
 Call of Cthulhu: Horror Roleplaying in the Worlds of H.P. Lovecraft
| 2 | 0 reads | |||
 Call of Cthulhu: Fantasy Roleplaying in the Worlds of H.P. Lovecraft
| 0 | 1 read |