Rachael Morlock 
Lewis and Clark Explore the Louisiana Territory [PDF ebook] 

This fascinating text details the incredible journey of Lewis and Clark through the Louisiana Territory, an expedition that would prove to be one of the most important chapters in American history. Readers will follow Lewis and Clark as they paddle up the Missouri River, ride over the Bitterroot Mountains, and observe the remarkable landscape that surrounds them. Critical aspects of social studies and science curriculum are related through the chronicle of this grand adventure.