US Department of Agriculture
Economic Research Service: South Dakota
Check out this state fact sheet on South Dakota from the U.S. Department of Agriculture. You will find information on the population, farm characteristics, and top commodities and exports. This would be a good starting point for...
50 States
50 States: South Dakota (Sd)
Find here a collection of links to information about the state of South Dakota. Categories include facts, government, geography, education, people, attractions, history, industry, and miscellaneous.