The Lewis & Clark College Special Collections has digitized some materials from its Expedition collections including:

The Coues-Anderson Manuscript

http://archiveswest.orbiscascade.org/ark:/80444/xv15064

http://digitalcollections.lclark.edu/files/original/f951f1b338003ab15e6f4c427e744bf6.tif

Missouri Indian by Karl Bodmer.

Karl Bodmer Images

https://specialcollections.lclark.edu/items/browse?collection=16

Maps of North America

https://specialcollections.lclark.edu/items/browse?collection=17