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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 | Mexico; A. von Humboldt’s work on [index entry] |
| 2 | Humboldt, Alexander von | Jefferson, Thomas | Alexander von Humboldt to Thomas Jefferson, 12 June … | 1809-06-12 | Mexico; A. von Humboldt’s work on [index entry] |
| 3 | Jefferson, Thomas | Humboldt, Alexander von | Thomas Jefferson to Alexander von Humboldt, 6 December … | 1813-12-06 | Mexico; A. von Humboldt’s work on [index entry] |
| 4 | Valli, Eusebio Giacinto | Jefferson, Thomas | Eusebio Valli to Thomas Jefferson, 5 June 1816 | 1816-06-05 | Mexico; A. von Humboldt’s work on [index entry] |