Delnore, Vic. TRACE: Seasonal Variability of Tropospheric Ozone. NASA, Global Tropospheric Experiment (GTE). Retrieved from the World Wide Web on 3 April 2002.
http://www.gte.larc.nasa.gov/

Earth Observatory Reference, NASA. Chemistry in the Sunlight. Retrieved from the World Wide Web on 17 February 2004.
http://earthobservatory.nasa.gov/Library/ChemistrySunlight/chemistry-sunlight3.html

Environment Canada. Ozone: A Direct (and Growing) Threat. Retrieved from the World Wide Web on 7 September 2004.
http://www.emanrese.ca/eman/reports/publications/Forest/part8.html

Finnish Environment Institute (SYKE). ICP IM Manual: Damage Parameters. 1998. Retrieved from the World Wide Web on 13 October 2005.
http://www.vyh.fi/eng/intcoop/projects /manual/chap7_16.htm

Hendrickson, Ole. A Decade of Forest Health Monitoring in Evidence of Air Pollution Effects. 2003. Retrieved from the World Wide Web on 24 October 2005.
http://www.ottawariverinstitute.ca/WatershedWays03/wwWhite-pines.htm

Krupa, Sagar V. Air Pollution, People, and Plants—An Introduction. St. Paul: The American Phytopathological Society, 1997.

Mirov, N.T. The Genus Pinus. New York: The Ronald Press Company, 1967.

Reid, Stephen J. Ozone and Climate Change. Amsterdam: Gordon and Breach Science Publishers, 2000.

Scorer, Richard S. Air Pollution Meteorology. Chichester: Horwood Publishing, 2002.

Sutton, Anne, and Myron Sutton. The Audubon Society Nature Guides: Eastern Forests. New York: Chanticleer Press, 1992.

U.S. Department of Agriculture, Forest Service. Development and Application of the Ozone Injury Index. Pacific Southwest Research Station. 1996. Retrieved from the World Wide Web on 30 October 2004.
http://www.fs.fed.us/psw/publications/documents/gtr-155

U.S. Department of Environmental Protection, Office of Air Quality, Planning & Standards. Health and Environmental Impacts of Ground Level Ozone. 2000. Retrieved from the World Wide Web on 12 September 2004.
http://www.epa.gove/air/urbanair/ozone/hlth.html

University of New Hampshire and NASA. Forest Watch. Retrieved from the World Wide Web on 30 October 2004.
http://www.forestwatch.sr.unh.edu