1Henry A. S. Dearborn to Thomas Jefferson, 14 October 1811 (Jefferson Papers)
The Comet: Elements of the Orbit of the Comet, now visible (Bowditch) [index entry]
2Thomas Jefferson to Henry A. S. Dearborn, 15 November 1811 (Jefferson Papers)
The Comet: Elements of the Orbit of the Comet, now visible (Bowditch) [index entry]