1. Estimated uses of water in the United States in 1980;Solley,1983
2. The extent and costs of contamination by agriculture;Lee;J. Soil Water Conserv.,1987
3. Report to Congress: Nonpoint Source Pollution in the U.S.;U.S. Environmental Protection Agency,1984
4. Potential pesticide contamination of groundwater for agricultural uses;Cohen,1984
5. Alginate controlled release formulations of metribuzin;Pepperman;J. Control. Release,1991