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Impact of irrigation development on income and trade, Eastern and Central South Dakota
Christensen, Thormod, (1969)
Simulating the impact of an irrigation project on a small regional economy
Brown, Ralph J., (1981)
Mineral and water resources of South Dakota
McGovern, George, (1964)
Estimating variations in production and income over time in farm plans for the Great Plains
Helfinstine, Rex D., (1959)
Farm plans for wheat farmers in North Central South Dakota
Helfinstine, Rex D., (1960)
Crop acreage, yields and production in South Dakota, 1926-1960, by economic areas and counties
Pengra, Ray F., (1961)