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Haluzan, N. (1970, January 01). Pollution prevention facts. Retrieved March 07, 2017, from http://pollutionarticles.blogspot.com/2012/03/pollution-prevention-facts.html
Haluzan, N. (1970, January 01). What is the worst kind of pollution? Retrieved March 07, 2017, from http://pollutionarticles.blogspot.com/2011/02/what-is-worst-kind-of-pollution.html
R. (2017, January 05). 40 Facts About Air Pollution. Retrieved March 07, 2017, from http://www.conserve-energy-future.com/various-air-pollution-facts.php
Writer, M. C. (2014, August 06). Reversing Pollution Damage to Our Land. Retrieved March 07, 2017, from http://jmedchemdef.org/Reversing-Pollution-Damage-to-Our-Land/