Earth System Atlas (http://earthsystematlas.sr.unh.edu/explorer/explorer.cgi)
US Environmental Protection Agency (http://www.epa.gov/ebtpages/environmentalmanagement.html) The mission of the Environmental Protection Agency is to protect human health and the environment. Since 1970, EPA has been working for a cleaner, healthier environment for the American people.
US Geological Survey Acid Rain Site: National Atmospheric Deposition Program (http://nadp.sws.uiuc.edu)- The purpose of the network is to collect data on the chemistry of precipitation for monitoring of geographical and temporal long-term trends.
2 February, 2005