NFL on FOX - Here is every NFL team to make a conference championship game in the last 10 years! Is your squad on this list??
List of National Football League champions, Packers Wiki
NFL Champions 1920-2022 Pro Football Hall of Fame
New York Giants in the Pro Football Hall of Fame: The Complete History - Sports Illustrated
NFL's 1st decade was the 1920s, when teams came and went
NFL All Championship Winners 1920-1969
A complete college football Empires Map of national championship claims
History of the National Football League championship - Wikipedia
List Of Super Bowl Winners - The History Junkie
NFL All Championship Winners 1920-1969
Every NFL Championship (1920-2020)
College football teams with the most national championships
College football national champions by year from 1869 to today - College Football HQ
Alphabetical list of NFL Teams - Cover32