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Cthulhu by Gaslight: Horror Roleplaying in 1890s England (Call of Cthulhu Horror Roleplaying, 1890s Era, #3303), by Barton, William A.
The 1920s Investigator's Companion: A Core Game Book for Players (Call of Cthulhu), by Jr. Faig,Kenneth,John Crowe,Keith Herber