1. Iowa crop production and soil erosion with cropland expansion;Amos;Am. J. Agric. Econ.,1983
2. Soil erosion control: Problems and progress;Blase;J. Soil Water Conserv.,1961
3. Soil loss: a question of values;Cook;J. Soil Water Conserv.,1982
4. Responsiveness of soil erosion losses in the Corn Belt to increased demands for agricultural products;Cory;J. Soil Water Conserv.,1978