List of NFL champions (1920–1969) - Wikipedia
University of Michigan Athletics -- Uniforms, 1900-2000
The Gridiron Uniform Database
Take a look back at a century of Chicago Bears uniforms, including 97 years of orange and blue (and 3 of red and gold) – Chicago Tribune
47 1920's Football Uniforms and equipment ideas | football uniforms, football, vintage football
Early history of NFL rich with Native American standouts
National Football League | History, Teams, & Facts | Britannica
The Gridiron Uniform Database: 1920 and 1921: Before the NFL - The APFA Years
1920 Canton Bulldogs season - Wikipedia
NFL 100 | NFL.com
1920's Football player | Football players, American football players, American football
Heritage Uniforms and Jerseys and Stadiums - NFL, MLB, NHL, NBA, NCAA, US Colleges: Chicago Bears Uniform and Team History
Football Uniform in the 1920's
Muncie was in at NFL's ground floor
Framed History NFL Uniforms of Oldest Franchises Print — The Greatest-Scapes
NFL turns 100: A look back at how players equipment has evolved
Top NFL Highlights 2010's - 1920's Decade by Decade! | NFL 100 - YouTube
History of the NFL from the year you were born – Chicago Tribune
History of NFL Uniforms
Football in the 1920's | Jay
Evolution of the NFL Player | NFL Football Operations
