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This video segment from IdahoPTV's D4K points out that the mission of the Corps of Discovery was map and to document the science of the plants, animals, land, and people of their journey. They wrote about 178 plants and 120 animals. You hear their descriptions in their own words from their journals.
Visit the D4K companion Web site to learn more about The Science of Lewis and Clark: D4K: “Science of Lewis and Clark"