1Sir John Sinclair to Thomas Jefferson, 25 May 1817 (Jefferson Papers)
The Code of Agriculture (J. Sinclair) [index entry]
2Thomas Jefferson to Mathew Carey, 13 March 1820 (Jefferson Papers)
The Code of Agriculture (J. Sinclair) [index entry]
3Thomas Jefferson to Mathew Carey, 31 July 1820 (Jefferson Papers)
The Code of Agriculture (J. Sinclair) [index entry]
4Mathew Carey & Son to Thomas Jefferson, 5 August 1820 (Jefferson Papers)
The Code of Agriculture (J. Sinclair) [index entry]
5Thomas Jefferson to Mathew Carey & Son, 14 August 1820 (Jefferson Papers)
The Code of Agriculture (J. Sinclair) [index entry]
6Mathew Carey & Sons to Thomas Jefferson, 30 June 1821 (Jefferson Papers)
The Code of Agriculture (J. Sinclair) [index entry]