Chicago Bears founder George Halas played a part in everything for NFL - Chicago Sun-Times
The Life And Career Of NFL Pioneer Fritz Pollard (Complete Story)
List of events at Soldier Field - Wikipedia
George Halas named NFL's fourth best coach of all time
JESSE JACKSON: NFL's Depression-Era Ban on Black Players Lingers in the Owner's Box - The Washington Informer
George Halas came 50 minutes from losing the Bears in 1933 — until soon-to-be Cardinals owner Charles Bidwill bailed him out - Windy City Gridiron
Throwback: The truth about George Halas and the NFL's ban on black players - Windy City Gridiron
George Halas Through the Years
Chicago Sports – ReadJack.com
1937 nfl championship game highlights : r/nfl
NFL History: 100 objects that tell the story of football - Sports Illustrated