William Clark. Oil on canvas attributed to John Wesley Jarvis, ca. 1810. © 1998, Missouri Historical Society Collections. Photograph by David Schultz, Missouri Historical Society.

Meriwether Lewis . Acc # 1936.30.1 Pastel on paper by Charles B.J.F. St. Memin, ca. 1803. Missouri Historical Society Art Collection. Photograph by Allied Photocolor, 1991. Por L-0110. Photograph and scan (c) 1991-2002, Missouri Historical Society.

Letter of Credit: Thomas Jefferson to Meriwether Lewis, 4 July 1803. Missouri Historical Society Archives. Photograph and scan (c) 1999, Missouri Historical Society.

William Clark's elkskin-bound field journal, closed. Missouri Historical Society Archives. NS 22184. Photograph by David Schultz, 1997. Photograph and scan (c) 1997-2002, Missouri Historical Society.

Great Rapids of the Columbia [River]. [Washington and Oregon]. Entry of 30 October-2 November 1805. Missouri Historical Society Archives. Photograph by David Schultz, 1995. Photograph and scan © 1995-2001, Missouri Historical Society.

Map of Lewis' River (Snake) and Clark's River, 1806, made at Camp Choppunnish on the Clearwater River, shows names of tribes and a diagram of rivers. Circular stains were made by hot kettle placed on map. Photograph by Cary Horton, 2002. NS 26118. (c) 2002, Missouri Historical Society.

Lewis [Meriwether] in Indian Dress (Shoshone). Engraving by Strickland, after St. Memin (painted 1807) published in Analectic Magazine and Naval Chronicle, 1816. Missouri Historical Society Archives. Scan (c) 2000, Missouri Historical Society.