In twelve remarkable volumes, Gary E. Moulton has edited the journals of the Lewis and Clark expedition of 1804–6, thus making clear and accessible to all readers the plethora of maps and words with which Meriwether Lewis and William Clark documented one of the greatest ventures of discovery in American history. With the Comprehensive Index, the thirteenth volume, Moulton completes his work—and offers everyone who consults the Journals a complete and detailed means of locating specific passages, references, and particular people or places within the larger work. Throughout the edition, his guiding principles have been clarity and ease of use. Consequently, the notes are indexed more thoroughly here than in most works and include modern place-names, modern denominations for Indian nations, and current popular and scientific names for various cited species. This volume also contains a list of corrections for earlier volumes.