1Thomas Cooper to Thomas Jefferson, 17 August 1814 (Jefferson Papers)
Leibniz, Gottfried Wilhelm; philosophy of [index entry]
2Thomas Jefferson to John Adams, 8 April 1816 (Jefferson Papers)
Leibniz, Gottfried Wilhelm; philosophy of [index entry]
3John Adams to Thomas Jefferson, 19 April 1817 (Jefferson Papers)
Leibniz, Gottfried Wilhelm; philosophy of [index entry]