1Thomas Jefferson to Nathaniel Macon, 24 September 1811 (Jefferson Papers)
...efforts, Macon associated himself with the Tertium Quids during the latter years of...
2Thomas Jefferson to James Madison, 30 May 1812 (Jefferson Papers)
Tertium Quids [index entry]
3Thomas Jefferson to Benjamin Waterhouse, 20 July 1816 (Jefferson Papers)
if Unitarianism, as a tertium quid, can fuse us with a part of them, let...