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- Humboldt, Alexander von (2)
- Jefferson, Thomas (2)
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| No. | Author | Recipient | Title | Date | Context |
|---|---|---|---|---|---|
| 1 | Jefferson, Thomas | Humboldt, Alexander von | Thomas Jefferson to Alexander von Humboldt, 6 March … | 1809-03-06 | Recueil d’observations astronomiques (Humboldt) [index entry] |
| 2 | Humboldt, Alexander von | Jefferson, Thomas | Alexander von Humboldt to Thomas Jefferson, 12 June … | 1809-06-12 | Recueil d’observations astronomiques (Humboldt) [index entry] |
| 3 | Vaughan, John | Jefferson, Thomas | John Vaughan to Thomas Jefferson, 20 August 1809 | 1809-08-20 | Recueil d’observations astronomiques (Humboldt) [index entry] |
| 4 | Humboldt, Alexander von | Jefferson, Thomas | Alexander von Humboldt to Thomas Jefferson, 20 December … | 1811-12-20 | Recueil d’observations astronomiques (Humboldt) [index entry] |
| 5 | Jefferson, Thomas | Humboldt, Alexander von | Thomas Jefferson to Alexander von Humboldt, 6 December … | 1813-12-06 | Recueil d’observations astronomiques (Humboldt) [index entry] |