Ball (gridiron football) - Wikipedia
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The NFL is putting tracking sensors inside its footballs for the first time - Vox
The NFL: 100 Years of football - Los Angeles Times
The Evolution of the Football
In an Innovative Sport, Football Chains Stand the Test of Time - The New York Times
The Bizarre History of the NFL's First Title Game - HISTORY
The History of the Football – The Actual Ball | Mental Itch
Football from Tom Brady's first NFL touchdown pass going up for auction
NFL: Fritz Pollard's pioneering role in American football history - BBC Sport
History of the American Football timeline | Timetoast timelines
How the Football Has Changed Since 1869 – Scout Life magazine
The Strange Origin of Football - Insight Replay
Ball (gridiron football) - Wikipedia
HOF Artifact of the Week | Pro Football Hall of Fame Official Site
American football - Wikipedia
Ball (gridiron football) - Wikipedia
Who Invented (American) Football - HISTORY
AFL football, early 1960's | Pro Football Hall of Fame Official Site
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How Katie Sowers became the first woman and gay coach in the Super Bowl - SBNation.com
The Evolution of the Football | Sutori
Downs with the Duke: The 10 Most Iconic Super Bowl Footballs | Wilson Sporting Goods
The AFL J5-V Football
First no-punt game in NFL: Buffalo Bills vs. San Francisco 49ers
How the NFL Football Got Its Shape | Live Science
