Portrait of Reuben Gold Thwaites, courtesy of the Wisconsin State Historical Society   
"The Upper Mississippi System, and the Missouri system as far as the Mandans." Map copied by William Clark, published in Thwaites.
The Upper Mississippi system, and the Missouri system as
far as the Mandans.
Map of the region of the Arikara villages on the Missouri The region of the Arikara villages, on the Missouri
Map of the Missouri from Pine Creek
The Missouri from Pine Creek... see details of this map to the right
Detail, Map of the Missouri from Pine Creek
Detail, Map of the Missouri from Pine Creek
Detail, sketch of the Missouri from Fort Mandan, part 1
Detail, Sketch of the Missouri from Fort Mandan, Part 1
Sketch of the Missouri from Fort Mandan, Part 1
Sketch of the Missouri from Fort Mandan, Part 1
Sketch of Missouri from Fort Mandan part 2

Sketch of Missouri from Fort Mandan part 2
Sketch of Missouri from Fort Mandan part 3

Sketch of Missouri from Fort Mandan part 3
Detail, Sketch of the Columbia River
Detail, Sketch of the Columbia River

Sketch of the Columbia River, Part 1
Sketch of the Columbia River, Part 2
Sketch of the Columbia River, Part 2
Sketch of the Columbia River, Part 3
Sketch of the Columbia River, Part 3
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Map of the Missouri from just below Antelope Creek
The Missouri from just below Antelope Creek