Map of Lewis's River (present-day Snake River) and Clark's River (present-day Bitteroot-Clark Fork-Pend Oreille combination of rivers) drawn by William Clark and Sundery Indians of the Choppunish [Nez Perce] Nation, May 29-31, 1806, A0289-20319. Missouri Historical Society Library and Research Center.

Map of Lewis's River (present-day Snake River) and Clark's River (present-day Bitteroot-Clark Fork-Pend Oreille combination of rivers) drawn by William Clark and Sundery Indians of the Choppunish [Nez Perce] Nation, May 29-31, 1806, A0289-20319. Missouri Historical Society Library and Research Center. https://mohistory.mobiusconsortium.org/repositories/2/digital_objects/9005 Accessed September 20, 2024.