1Napoleon B. Coleman to Thomas Jefferson, 18 April 1819 (Jefferson Papers)
Herschel, William; British astronomer [index entry]
2Edward Postlethwayt Page to Thomas Jefferson, [ca. 10 May 1820] (Jefferson Papers)
Herschel, William; British astronomer [index entry]
3Thomas Skidmore to Thomas Jefferson, 18 August 1822 (Jefferson Papers)
Herschel, William; British astronomer [index entry]
4Thomas Jefferson to Thomas Skidmore, 29 August 1822 (Jefferson Papers)
Herschel, William; British astronomer [index entry]