Bibliography

                 http://pubs.usgs.gov/gip/acidrain/2.html

                http://www.eagle.ca/~matink/themes/Environ/acidrain.html

                http://www.ec.gc.ca/acidrain/

                http://www.policyalmanac.org/environment/archive/acid_rain.shtml

                http://www.lehigh.edu/~kaf3/books/reporting/acid.html

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