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Date visited: August 8, 1803
Humboldt, Bonpland, and Montúfar “passed through Querétaro and Salamanca to Guanajuato, a city of fifty thousand inhabitants, celebrated for its mines, richer than those of Potosi. Count Valenciana's mines, which has a perpendicular depth of 1,840 French feet [1,963 English feet], is the deepest and richest mine of the universe.” A. v. Humboldt, “Philadelphia Abstract,” 1804
“From Guanajuato [Humboldt, Bonpland, and Montúfar] returned by way of the valley of Santiago to Valladolid [today: Morelia], in the ancient kingdom of Michoacán, one of the most fertile and charming provinces of the kingdom.” A. v. Humboldt, “Philadelphia Abstract,” 1804