1John Adams to Thomas Jefferson, 15 July 1813, with Postscript from Abigail Adams to Thomas Jefferson, [ca. 15 July 1813] (Jefferson Papers)
Adams, John; on governmental systems [index entry]
2John Adams to Thomas Jefferson, with postscript by Abigail Adams, 20 June 1815 (Jefferson Papers)
Adams, John; on governmental systems [index entry]
3John Adams to Thomas Jefferson, 10 October 1817 (Jefferson Papers)
Adams, John; on governmental systems [index entry]
4John Adams to Thomas Jefferson, 3 February 1821 (Jefferson Papers)
Adams, John; on governmental systems [index entry]