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List of counties in South Dakota - Wikipedia
South Dakota | Flag, Facts, Maps, & Points of Interest
South Dakota - Wikipedia
Geography of South Dakota - Wikipedia
South Dakota Maps & Facts - World Atlas
Travel South Dakota | Great Faces and Great Places
A first-timer's guide to South Dakota - Lonely Planet
South Dakota Pictures and Facts - National Geographic Kids
Map of the State of South Dakota, USA - Nations Online Project
South Dakota summary | Britannica