Publications (2) 
| Title | Code | Date | Publisher | System (Setting) |
|---|---|---|---|---|
 1920s Investigator's Companion Vol. I | CHA2343 | 1993 | Chaosium | Call of Cthulhu (Classic) |
| 1920s Investigator's Companion Vol. II | CHA2346 | 1994 | Chaosium | Call of Cthulhu (Classic) |
| Title | Code | Date | Publisher | System (Setting) |
|---|---|---|---|---|
| 1920s Investigator's Companion Vol. I | CHA2343 | 1993 | Chaosium | Call of Cthulhu (Classic) |
| 1920s Investigator's Companion Vol. II | CHA2346 | 1994 | Chaosium | Call of Cthulhu (Classic) |