A history of NFL wild card teams to make it to Super Bowls | RSN
NFL Champions 1920-2018 | Pro Football Hall of Fame Official Site
Super Bowl winners by player: Who has the most rings in NFL history? | Sporting News
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Top 10 Moments: Browns play first NFL game against the defending NFL Champion Philadelphia Eagles on Sept. 16, 1950
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The NFL: 100 Years of football - Los Angeles Times
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Super Bowl I - Wikipedia
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National Football League - Wikipedia
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History of the National Football League championship - Wikipedia
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Today in Pro Football History: 1933: Bears Edge Giants in First NFL Championship Game
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History of the National Football League championship - Wikipedia
Very Rare 1st Championship Game AFL vs NFL Super Bowl I Commemorative Pin Circa 1967 | Property Room
