Humboldt, Alexander von, 1769-1859

Humboldt

From 'The Gods and Other Lectures'

Robert Green Ingersoll

Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 2

Alexander von Humboldt
Aimé Bonpland

Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1

Alexander von Humboldt
Aimé Bonpland