xxxv, [3], 335 pp. Edited with an Introduction and Notes by Ernest Staples Osgood. Illustrated with collotype facsimiles of the entire collection of 67 field note documents; a few figure drawings, facsimile map; portrait vignette from an engraving on the title page. (Folio) 14x10, original green and black cloth, stamped in gilt, pictorial jacket. First Edition.

A well-organized and meticulously edited volume with extensive annotations and a very insightful introduction for these rare and valuable documents of one of the most famous explorations in American history. The documents fall into two sections: The Camp Dubois Journal covering the formation of the expedition, the preparations, and the first winter spent in the field; and the River Journal (May 14, 1804 to April 3, 1805) covering the 1600 mile trip up the Missouri to the Mandan Villages.