Jill Keppeler 
Team Time Machine Tags Along with Lewis and Clark [PDF ebook] 

In 1804, a group of brave explorers set out from Saint Louis, Missouri, to study the Louisiana Purchase and the Pacific Northwest. Three members of Team Time Machine get to tag along. In this adventure, Mia, Ben, and Sam travel with Lewis and Clark and their Corps of Discovery as they set out to map the new U.S. territory and learn about all the plants, animals, and people there. Young readers will learn much about this amazing expedition through humor, adventure, and colorful photographs and illustrations.