Jefferson Papers Indexes | Papers of Thomas Jefferson, Retirement Series (all volumes) | R | Recueil d’observations astronomiques (Humboldt)
Thomas Jefferson to Alexander von Humboldt, 6 March 1809 [Retirement Series 1:24]
Alexander von Humboldt to Thomas Jefferson, 12 June 1809 [Retirement Series 1:264]
John Vaughan to Thomas Jefferson, 20 August 1809 [Retirement Series 1:455]
Alexander von Humboldt to Thomas Jefferson, 20 December 1811 [Retirement Series 4:352]
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