American Society of Agricultural Engineers. 1985. Erosion and Soil Productivity. Proceedings of the national symposium on erosion and soil productivity, December 10–11, 1984, New Orleans. American Society of Agricultural Engineers Publication 8-85. St. Joseph, MI: Author.

Edwards, W.M. 1992. Soil structure: Processes and management. In Soil Management for Sustainability, ed. R. Lal and F.J. Pierce, pp. 7–14. Ankeny, IA: Soil and Water Conservation Society. This is the reference for the Ohio experiment on the monitoring of runoff.

Lal, R., and F.J. Pierce, eds. 1991. Soil Management for Sustainability. Ankeny, IA: Soil and Water Conservation Society.

Ontario Ministry of Agriculture, Food, and Rural Affairs. 1997. Soil Management. Best Management Practices Series. Available from the Ontario Federation of Agriculture, Toronto, Ontario, Canada.

Reganold, J.P., L.F. Elliott, and Y.L. Unger. 1987. Long-term effects of organic and conventional farming on soil erosion. Nature330: 370–372. This is the reference for the Washington State study of erosion.

Smith, P.R., and M.A. Smith. 1998. Strip intercropping corn and alfalfa. Journal of Production Agriculture 10: 345–353.

Soil and Water Conservation Society. 1991. Crop Residue Management for Conservation. Proceedings of national conference, August 8–9, Lexington, KY. Ankeny, IA: Author.

United States Department of Agriculture. 1989. The Second RCA Appraisal: Soil Water, and Related Resources on NonfederalLand in the United States, Analysis of Conditions and Trends.Washington, DC: Government Printing Office.