A. Arrowsmith's Map of North America, London, 1802.
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Aaron Arrowsmith (1750 - 1823)
A Map Exhibiting All the New Discoveries in the Interior Parts of North America . . . London: 1802
Hand-colored, engraved map

Credit: Library of Congress, Geography and Map Division

Aaron Arrowsmith's map, published in London in 1802, was the best available to Lewis, who used it to plan his expedition.

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