National Water-Quality Assessment (NAWQA) Program
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Nakagaki, Naomi, and Wolock, D.M., 2005, Estimation of agricultural pesticide use in drainage basins using land cover maps and county pesticide data: U.S. Geological Survey Open-File Report 2005-1188, 46 p. Available Online
Thelin, G.P., Gianessi, L.P., 2000, OFR 00-250 Method for Estimating Pesticide Use for County Areas of the Conterminous United States. U.S. Geological Survey Open-File Report 00-250, 62 p. Available Online
Gilliom, Robert J.; Thelin, Gail P., 1997 Classification and mapping of agricultural land for National Water-Quality Assessment: U.S. Geological Survey Circular 1131, Available Online
U.S. Department of the Interior | U.S. Geological Survey
URL: http://water.usgs.gov
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