Call of Cthulhu Roleplaying Game (D20)

Horror (Cthulhu Mythos) Crime (Spy / Espionage) Crime (Conspiracy) Modern

Rulebooks

Delta Green

Campaign Setting Sourcebook Delta Green Call of Cthulhu: Adventure: 1990s (1) Crime (Spy / Espionage) Horror (Cthulhu Mythos) Crime (Conspiracy) Modern

Call of Cthulhu Roleplaying Game

Campaign Setting Core Rules Cthulhu Classic (1920s & 1930s) Call of Cthulhu: D20 System (1) Horror (Cthulhu Mythos)

Parapsychologist's Handbook

Sourcebook Miskatonic University Library Association Monographs (1) Horror (Cthulhu Mythos)

Nocturnum

Adventure Nocturnum (1) Horror (Cthulhu Mythos)

H. P. Lovecraft's Arkham

Campaign Setting Adventure Sourcebook Cthulhu Classic (1920s & 1930s) Horror (Cthulhu Mythos)