Alexander von Humboldt. From the Americas to the Cosmos. Coordinated by: Raymond Erickson, Mauricio A. Font, Brian Schwartz. Part V: Knowledge and Worldview. Chapter 35. New York: Bildner Center for Western Hemisphere Studies 2004, 437-443.
https://www.gc.cuny.edu/CUNY_GC/media/CUNY-Graduate-Center/PDF/Centers/Bildner%20Center%20for%20Western%20Hemisphere%20Studies/Publications/Colley35.pdf
Colley, Ann C.: Writing In and Out of Time, in: Alexander von Humboldt. From the Americas to the Cosmos. Coordinated by: Raymond Erickson, Mauricio A. Font, Brian Schwartz. Part V: Knowledge and Worldview. Chapter 35. New York: Bildner Center for Western Hemisphere Studies 2004, 437-443.
https://www.gc.cuny.edu/CUNY_GC/media/CUNY-Graduate-Center/PDF/Centers/Bildner%20Center%20for%20Western%20Hemisphere%20Studies/Publications/Colley35.pdf
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