What were the original NFL teams?
National Football League, American Football Wiki
NFL Football Teams - Official Sites of all 32 NFL Teams
History of the National Football League - Wikipedia
National Football League - Wikipedia
NFL Logo, symbol, meaning, history, PNG, brand
NFL Football Teams - Official Sites of all 32 NFL Teams
National Football League - New World Encyclopedia
Team Histories NFL Football Operations
NFL Football Teams - Official Sites of all 32 NFL Teams