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NFL's first game played in Dayton, Ohio | NFL history
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The Founding of American Football | SportRx
College football history: Notable firsts and milestones | NCAA.com
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History of American Football Facts: From Invention To The Super Bowl | HistoryExtra
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Kurt Warner | Biography & Facts | Britannica
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Why we watch football on Thanksgiving | CNN
NFL 100 | NFL.com
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Super Bowl History: Why Are Footballs Shaped Like That? | Time
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