Instruct: Classify Amazon reviews into positive or negative sentiment
Query: excellent account of Lewis & Clark journey

This is an excellent acount of the transcontinental journeyof Lewis and Clark in 1803-1806, by prize-winning historianStephen Ambrose. The book gains immediacy from the factthat Mr. Ambrose has actually retraced the steps ofLewis and Clark, and thoroughly knows the country _the Missouri Valley, the northern Rockies and the ColumbiaRiver country of Oregon and Washington.