History of the Chicago Bears - Wikipedia
Favorite Sports Venues Across America Includes Only 1 in Maine
Veterans & Returning Players - NFL.com
Gale Sayers, electrifying Hall of Fame running back for Chicago Bears, dies at 77 - The Washington Post
Are there any NFL Hall of Fame members with no postseason experience? If there are none, who are some that have the least postseason experience? - Quora
The Britannica Guide To Football, PDF, American Football Leagues
Gale Sayers: Bears Hall of Famer's legacy in Chicago
History of the Chicago Bears - Wikipedia
Gale Sayers of the Chicago Bears, moves ball toward Pittsburgh goal line as he is tackled short of pay dirt in first period in Chicago on November 9, 1969. Tackling Sayers are Andy
NFL History: 100 objects that tell the story of football - Sports Illustrated