The NFL: 100 Years of football - Los Angeles Times
Super Bowl history: How the NFL's first champion was declared
Arizona Cardinals Team History and Timeline - Sports Illustrated
List of NFL champions (1920-1969), American Football Database
NFL's 1st decade was the 1920s, when teams came and went
Plantation Florida Local Events, News, Weather & Maps
How many years each NFL team has been waiting for a championship [OC] : r/ nfl
National Football League, American Football Wiki
NFL: How All 32 Teams Got Their Names, News, Scores, Highlights, Stats, and Rumors
Timeline of the National Football League - Wikipedia
Sports Semiotics in: Sports Semiotics
1933 NFL Championship Game
Inductees, Football Players & Coaches
NFL Logos - National Football League Logos - Chris Creamer's Sports Logos Page