"Reise in die Aequinoctial-Gegenden des neuen Continents - Band I" from Alexander von Humboldt. Deutscher Naturforscher (1769-1859).

"Reise in die Aequinoctial-Gegenden des neuen Continents - Band II" from Alexander von Humboldt. Deutscher Naturforscher (1769-1859).

"Reise in die Aequinoctial-Gegenden des neuen Continents - Band III" from Alexander von Humboldt. Deutscher Naturforscher (1769-1859).

"Reise in die Aequinoctial-Gegenden des neuen Continents - Band IV" from Alexander von Humboldt. Deutscher Naturforscher (1769-1859).

"Personal Narrative of Travels to the Equinoctial Regiona of America during the years 1799-1804-Volume II" from Alexander von Humboldt. Prussian geographer, naturalist and explorer, and the younger brother of the Prussian minister (1769-1859).

"Personal Narrative of Travels to the Equinoctial Regions of America 1799-1804 Vol. III" from Alexander von Humboldt. Prussian geographer, naturalist and explorer, and the younger brother of the Prussian minister (1769-1859).

"Personal Narrative of Travels to the Equinoctial Regions of America during the years 1799-1804- Volume I" from Alexander von Humboldt. Prussian geographer, naturalist and explorer, and the younger brother of the Prussian minister (1769-1859).