- Gorp: Lewis and Clark Trail
- Features trail information and links to other online resources for historical facts.
- Jewel Cave National Monument
- Contains information about the monument, cave tours, historic and visitor areas, and surface activities.
- Lewis and Clark 200
- Provides a directory in commemoration of the bicentennial of the Lewis and Clark expedition. Also contains travel information.
- Lewis and Clark Bicentennial Commemorative Products
- Sells commemorative merchandise online. Also contains return and privacy policy and links to other sites.
- Lewis and Clark National Historic Trail
- Provides thorough information about the National Park Service.
- The Lewis and Clark Trail Guide
- Features a listing of lodging and dining establishments, attractions, services, and events. Also presents descriptions of key historic sites.
- National Park Service: South Dakota
- Official site of the U.S. Department of the Interior. Description of the national parks in South Dakota is given, as well as resources and details of history, culture, nature, and science.
- Traveler's Guide to the Lewis and Clark Trail
- Contains history, maps and travel information, products, and expedition facts and stories.
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