This teacher's guide accompanies the Public Broadcasting System (PBS) four-part videotape documentary about the journey of Meriwether Lewis and William Clark as they made their way from the Missouri River to the Pacific Ocean. The guide introduces the documentary's major themes through 4 lessons which focus on the geography and events that shaped the journey. The lessons are (1) "Preparing for the Journey"; (2) "To the Continental Divide"; (3) "Reaching the Pacific"; and (4) "Returning Home." Each lesson includes background information, discussion questions, activities for individual, small group, or whole class involvement. A map and time line are provided. The accompanying video segment index indicates the volume, hour, minute, and second that material about a key event, organization, or person featured in the video will occur. There are an alphabetical index and a subject index focusing on events, organizations and groups, and people. (MM)