When the "Atlas of the Lewis and Clark Expedition" appeared in 1983 critics hailed it as a publishing landmark in western history. Fully living up to the promise of the first volume were the second volume, which began the actual journals and brought the expedition through its first year to August 1804, and the third volume, which brought the explorers through a winter at Fort Mandan, present North Dakota, and to April 1805.This eagerly awaited fourth...