When the President of the United States tells you to take-a-hike, you do! So, when Thomas Jefferson told Meriwether Lewis and William Clark to find a passage across America, they did! With this book in hand, kids will walk back in time as they explore--side-by-side with Lewis and Clark and Sacagawea--the undiscovered country in the heart of America. Maps, mazes, trivia, journal entries, and a wide variety of interactive reading will get all your little explorers raring to get out there and make their own discoveries! 32 pages.