George Halas (aka Papa Bear) Founder of the Chicago Bears and the NFL
Chicago Bears legend Dick Butkus dead at 80
Some Papa Bear history at the St Paul Saints baseball museum in Minnesota : r/CHIBears
Legendary Chicago Bears & University of Illinois linebacker Dick Butkus passes away at 80, 101.5 WCIL-FM
Reaction to the death of Chicago Bears great Dick Butkus
George Halas' FBI connection: File reveals late Chicago Bears owner, NFL cofounder helped feds 'on occasions' - Chicago Sun-Times
Reaction to the death of Chicago Bears great Dick Butkus
Grave Story: George Halas (1895-1983) – RIP Baseball
Illinois Alumni Magazine - Fall 2017 - PAPA BEAR