Jefferson Papers Indexes | Papers of Thomas Jefferson, Retirement Series (all volumes) | N | Nivellement barométrique (Humboldt)
John Vaughan to Thomas Jefferson, 19 August 1809 [Retirement Series 1:452]
John Vaughan to Thomas Jefferson, 20 August 1809 [Retirement Series 1:455]
Thomas Jefferson to John Vaughan, 31 August 1809 [Retirement Series 1:482]