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Collage of Lewis and Clark journals
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Collage of Lewis  and Clark journals: in the background is the map of their trip; open journal on the left with river is "draught of the falls and portage of the Missouri River;"

Credit: American Philosophical Society

The Lewis and Clark expedition returned with a wealth of new information about North American geography, Indian tribes, and natural history. Despite Jefferson's repeated entreaties, Lewis never did publish his findings. This task would be left to William Clark and Philadelphian Nicholas Biddle.

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