1Burgess Allison to Thomas Jefferson, [3 November 1813] (Jefferson Papers)
It is now a year since I have had a letter from M r Hawkins ; he was then, and had been some time engaged as an Engineer, and had undertaken two very stupendous works: one of them the constructing a Tunnel under the River Thames about eleven miles below London , which he had nearly compleated. The other was a Tunnel through Shuters hill , about eight miles from London , to level the eastern road.