| state.nd.us | State Historical Society of North Dakota |
| pbs.org | PBS Online: Lewis and Clark |
| nps.gov | Knife River Indian Villages National Historic Site (national Park Service) |
| ndtourism.com | North Dakota Travel and Tourism |
| ndlewisandclark.com | Lewis and Clark in North Dakota |
| mhanation.com | Mandan, Hidatsa, and Arikara Nation |
| ohs.org | Oregon Historical Society |
| explorethebigsky.org | Explore! The Big Sky |
| childrensmuseum-yunker.org | The Children's Museum at Yunker Farm |
| lewisandclarkphila.org | Lewis and Clark Trail Heritage Foundation, Philadelphia Chapter |
United States , North Dakota , Bismarck