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National Football League (NFL) | History, Teams, & Facts
History of the National Football League - Wikipedia
The Birth of the National Football League | HISTORY
Sept. 17, 1920 -- The Founding of the NFL | Pro Football Hall of …
National Football League - Wikipedia
NFL Origins: How Did the League Begin? - Pro Football Network
Remembering the NFL's humble origins on its 100th birthday
NFL founded in Canton on Sept. 17, 1920 - Pro Football Hall of …
Timeline of the National Football League - Wikipedia
The Complete History Of The NFL | FiveThirtyEight