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How many volumes were published from Alexander von Humboldt's South American expedition results?
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Alexander von Humboldt
Alexander von Humboldt, oil on canvas by Julius Schrader, 1859; in the Metropolitan Museum of Art, New York City.
Alexander von Humboldt published 30 volumes to document the scientific results of his South American expedition. He spent the years between 1804 and 1827 in Paris distilling the data he and Aimé Bonpland had collected into this extensive collection.12