1Joseph Milligan to Thomas Jefferson, [before 12 January 1819] (Jefferson Papers)
On the Principles of Political Economy, and Taxation (D. Ricardo) [index entry]
2Thomas Jefferson to Joseph Milligan, 12 January 1819 (Jefferson Papers)
On the Principles of Political Economy, and Taxation (D. Ricardo) [index entry]
3Joseph Milligan to Thomas Jefferson, 18 January 1819 (Jefferson Papers)
On the Principles of Political Economy, and Taxation (D. Ricardo) [index entry]
4Joseph Milligan to Thomas Jefferson, 27 November 1820 (Jefferson Papers)
On the Principles of Political Economy, and Taxation (D. Ricardo) [index entry]