science.gov http://www.science.gov

AGRICOLA - http://agricola.nal.usda.gov/

National Plant Database http://plants.usda.gov

Agriculture Network Information Center http://www.central.agnic.org/

Invasive Species http://www.invasivespecies.gov/

TOXNET http://toxnet.nlm.nih.gov/

United Nations Environment Programme - UNEP http://www.unep.org/

EnvironmentalChemistry.com: http://environmentalchemistry.com/

World Resources Institute http://www.wri.org/

FS Database (Forest Service) http://sirsi.fs.fed.us/

National Library for the Environment http://www.ncseonline.org/NLE/

American Rivers http://www.amrivers.org/