内容简介：
Chip and Marty go on another adventure of a lifetime After falling asleep in Mr. Sandman's U.S. history class, they wake up on May 14, 1804 ready to begin the journey west with Lewis and Clark Along the way to finding a waterway from the Missouri River to the Pacific Ocean they experience a buffalo hunt, have a grizzly bear encounter, and learn how to survive in the wilderness. The explorers meet many different American Indian cultures along the way including a Shoshone Indian, named Sacagawea, who helps them reach their destination. Join Chip and Marty as they go back 200 years into history for a fun-filled, fact-packed adventure with Meriwether Lewis and William Clark on the "Voyage of Discovery."