1. Pesticides in;Barbash,1996
2. 1999. Distribution of major herbicides in ground water of the United States. US Geological Survey Water-Resources Investigations Report 98-4245. At URL http://ca.water.usgs.gov/pnsp/rep/wrir984245/.
3. Relative risks of transformation products of pesticides for aquatic ecosystems
4. The behaviour of 39 pesticides in surface waters as a function of scale
5. 1999. The quality of our nation's waters?nutrients and pesticides. US Geological Survey Circular 1225; 82 pp. At URL http://water.usgs.gov/pubs/circ/circ1225/.