Ball (gridiron football) - Wikipedia
HOF Artifact of the Week | Pro Football Hall of Fame Official Site
Denver Broncos
Who Invented (American) Football - HISTORY
AFL football, early 1960's | Pro Football Hall of Fame Official Site
The First Forward Pass in Pro Football History Was Against Moundsville — Or Was It? – Moundsville: PBS Film & Magazine
The Evolution of the Football
The Evolution of the Football | Sutori
In an Innovative Sport, Football Chains Stand the Test of Time - The New York Times
NFL 100 | NFL.com
NFL: Fritz Pollard's pioneering role in American football history - BBC Sport
Is This the NFL's First Female Player? | News, Scores, Highlights, Stats, and Rumors | Bleacher Report
How the NFL Football Got Its Shape | Live Science
How Did the Pigskin Get Its Shape? | Arts & Culture| Smithsonian Magazine
History of the American Football timeline | Timetoast timelines
/cdn.vox-cdn.com/uploads/chorus_asset/file/19628175/Katie_Sowers.jpg "How Katie Sowers became the first woman and gay coach in the Super Bowl - SBNation.com")
How Katie Sowers became the first woman and gay coach in the Super Bowl - SBNation.com
:no_upscale()/cdn.vox-cdn.com/uploads/chorus_asset/file/7005361/IMG_1631%20(1).jpg "The NFL is putting tracking sensors inside its footballs for the first time - Vox")
The NFL is putting tracking sensors inside its footballs for the first time - Vox
The Evolution of the Football
First no-punt game in NFL: Buffalo Bills vs. San Francisco 49ers
Ball Placement - The Art & Science - Referee.com
The History of the Football – The Actual Ball | Mental Itch
The Bizarre History of the NFL's First Title Game - HISTORY
