Intended for use in elementary and high school education, this Web site includes a teacher's guide and three lesson plans. The site contains images of museum specimens, scientific drawings, and field photos of the plant and animal species observed by Meriwether Lewis and William Clark, along with journal excerpts, historical notes, and references for many of these examples as well as the date and location of observation. The site may be searched by species groups (mammals, plants, birds, fish, reptiles, amphibians), by location (interactive map, the collection, or search), or by date (interactive map-timeline, or the collection). The "Resources" section includes suggestions for teachers as well as links to sites to Web sites with additional information about the plant and animal species. The teacher's guide provides ideas to get students immersed in U.S. history, geography, social studies, and the natural world at the beginning of the 19th as well as the 21st century. It contains ideas (by Susan Metcalfe and Robert Costello) for grades 3-5, grades 6-8, and grades 9-12. The lesson plan, "Beginning Botany with Camas" (Gail McEachron), specifies grade level, purpose, and previous knowledge; cites objectives; provides a detailed procedure; offers background information; addresses standards; and lists references. The lesson plans, "Clark's Nutcracker" and "Grizzly Survival" (Gail McEachron), present background information before following the same procedure as the first lesson. (BT)