The L&C expedition from the Mississippi to the Pacific and back is correctly presented in textbookish prose.
Noonan presents highlights of the L&C expedition through the "Louisiana Purchase" territories (central USA, from the Mississippi to the Rocky Mtns.) and on to the Pacific. His textbook-ish approach does little justice to these brave men and the extraordinary challenges of their journey. By this telling, one might even wonder why it is famous. Young readers should wait to read the more adult, historical fiction of Sacajawea by Anna Lee Waldo.