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Tremendous map of North America, exhibiting early details of Lewis & Clark's expedition and up to date information on the search for a northwest passage.

There are two Salt Lakes, each linked by Rivers to the Pacific Ocean and each other. Lots or early Indian detail and a fabulous treatment of the drainage system of the Upper Mississippi, Missouri and Columbia Rivers, likely one of the most advanced of the era. The region immediately west of the Mississippi retains the various Spanish regional names, including St. Louis, Cape Girardeau, Lawrence, etc. Missouri and Columbia Territories dominate the Western US claims. Early naming of the Yellowstone River.

California Missions are named.