Soil survey of Codington County, South DakotaToivo J Ollila, United States Soil Conservation Service, South Dakota Agricultural Experiment Station1966
Appraisal of the Water Resources of the Big Sioux Aquifer, Codington and Grant Counties, South DakotaLarry D. Putnam1996
Effects of Alternative Wheat and Feed Grain Prices on Optimum Farm Plans and IncomeErwin O. Ullrich1972EN