Alexander von Humboldt Quotes
Alexander von HUMBOLDT (1869). “Personal narrative of travels to the equinoctial regions of America”, p.288
"Cosmos". Book by H.G. Bohn, v2, p. 589,595, 1860.
Alexander von Humboldt (1814). “Political Essay on the Kingdom of New Spain: Containing Researches Relative to the Geography of Mexico, the Extent of Its Surface, and Its Political Division Into Intendancies, the Physical Aspect of the Country, the Population, the State of Agriculture and Manufacturing and Commercial Industry, the Canals Projected Between the South Sea and Atlantic Ocean, the Crown Revenues, the Quantity of the Precious Metals which Have Flowed from Mexico Into Europe and Asia, Since the Discovery of the New Continent, and the Military Defence of New Spain”, p.133
Alexander von Humboldt, Aimè Bonpland (1852). “Personal Narrative of Travels to the Equinoctial Regions of America, During the Years 1799-1804”, p.415