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South Dakota - Wikipedia
South Dakota Official State Homepage - Citizen Services
Travel South Dakota | Great Faces and Great Places
South Dakota | Flag, Facts, Maps, & Points of Interest | Britannica
24 Top Things to Do in South Dakota - U.S. News Travel
Things to Do - Travel South Dakota
14 Top-Rated Tourist Attractions in South Dakota - PlanetWare
South Dakota - Simple English Wikipedia, the free encyclopedia
Sioux Falls, South Dakota - Wikipedia
South Dakota | State Facts & History - Infoplease