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...