Avalon: The County of Somerset
Tags: 1920s, England, Somerset
Cubicle 7 Entertainment: Call of Cthulhu 6 (2010 )

Shadows over Scotland
Tags: 1920s, England, Scotland
Cubicle 7 Entertainment: Call of Cthulhu 6 (2011 Hardcover)

Call of Cthulhu Investigator Handbook
Tags: 1920s
Chaosium: Call of Cthulhu 7 (2014 Hardcover)

Cthulhu Britannica: London
Tags: 1920s, London
Cubicle 7 Entertainment, UK: Call of Cthulhu 7 (2015 Box)

The Curse of Nineveh
Tags: 1920s, London
Cubicle 7 Entertainment, UK: Call of Cthulhu 7 (2015 Hardcover)

Spirit of the Century
Tags: 1920s, fudge dice
Evil Hat Productions: Fate 3 (2006 )
Evil Hat Productions: Fate 3 (2006 Hardcover)

Spirit of the Season
Tags: 1920s
Evil Hat Productions: Fate 3 (2007 PDF)
Evil Hat Productions: Fate 3 (2008 )

Delta Green: Dark Theatres
Tags: 1920s, 1940s, Delta Green, Innsmouth, Karotechia, Nazis, Vietnam, Vietnam War, World War II
Armitage House: Fiction (1999 )
Armitage House: Fiction (2001 TPB)
Pagan Publishing: Fiction (2012 TPB)

Dinocalypse Now
Tags: 1920s, century club, dinosaurs
Evil Hat Productions: Fiction (2012 TPB)

The Journal of Neve Selcibuc
Tags: 1920s, London
Cubicle 7 Entertainment, UK: Fiction (2015 Hardcover)

The Journal of Reginald Campbell Thompson
Tags: 1920s, London
Cubicle 7 Entertainment, UK: Fiction (2015 Hardcover)

Gangbusters: The Blue Book Detective Agency Beginner Rules
Tags: 1920s, 1930s
Black Mask Games: GangBusters 4 (2016 Digest)

Legacy of Justice: The Pulp Era
Tags: 1910s, 1920s, 1930s, M&M Superlink
Big Finger Games: Mutants & Masterminds 2 (2006 PDF)
Big Finger Games: Mutants & Masterminds 2 (2007 )

Spirit of the Season
Tags: 1920s
Atomic Sock Monkey Press: PDQ (2007 PDF)

Many Fires
Tags: 1920s, 1930s, Mexico
Pelgrane Press: Trail of Cthulhu 1 (2011 PDF)