http://www.citycollegiate.com/industry1.htm

http://www.epa.gov/pesticides/about/

http://www.edis.ifas.ufl.edu

http://www.chem-tox.com/pesticides

http://www.kidsforsavingearth.org/mnchec/articles/pesticides.htm

http://www.bugpage.com/icp.html

http://www.prostarwater.com/article-herbicides.html