Detail from DuPratz’s A Map of Louisiana

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Quoted from the site: A Map of Louisiana, with the course of the Missisipi is included in the first English edition of Le Page du Pratz’s book, The History of Louisiana, or of the western parts of Virginia and Carolina (London, 1763). Meriwether Lewis borrowed the English edition from Benjamin Smith Barton, his botany tutor, and took it on the expedition to the Pacific. Several references to Le Page du Pratz’s work appear in the journals of the expedition.