The Original 14 NFL Teams | Visual.ly
History of American Football Facts: From Invention To The Super Bowl | HistoryExtra
Another Football League Is on the Edge of Folding - The New York Times
NFL 100 | NFL.com
NFL's first game played in Dayton, Ohio | NFL history
History of American football - Wikipedia
Who Invented American Football?
Odd & original football rules that are no longer used - Dawgs By Nature
Why we watch football on Thanksgiving | CNN
History of American Football Facts: From Invention To The Super Bowl | HistoryExtra
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Who Invented (American) Football - HISTORY
History of American football - Wikipedia
Kurt Warner | Biography & Facts | Britannica
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Who Invented (American) Football - HISTORY
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Oldest NFL Teams: What are the oldest NFL Teams? | Marca
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College football history: Notable firsts and milestones | NCAA.com
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