References: Shepard, D. (2008.). The history of fossil fuels. Retrieved from www.ehow.com 12 environmental effects of coal mining. (2011, June 14). Retrieved from www.environment911.org Sulfur dioxide. (2012, January 06). Retrieved fromhttp://www.epa.gov/air/airtrends/sulfur.html Cities in the early 1800s. (n.d.). Retrieved from http://historycentral.com/NN/America/Cities.html History of mine safety and health legislation. (n.d.). Retrieved from www.msha.gov Reclaiming abandoned mine lands. (n.d.). Retrieved from www.osmre.gov Russell, S. (2012, April 12). Smog limit laws. Retrieved from www.ehow.com Title IV: Acid Deposition Control.” (2011, April 12) Clean Air Act, United States. The Earth Encyclopedia. Retrieved from http://www.eoearth.org/article/Clean_Air_Act,_United_States#gen4 Government and public health. (2012). Retrieved from http://www.bbc.co.uk/bitesize/standard/history/1830_1930/public_health/revision/3/
References: Shepard, D. (2008.). The history of fossil fuels. Retrieved from www.ehow.com 12 environmental effects of coal mining. (2011, June 14). Retrieved from www.environment911.org Sulfur dioxide. (2012, January 06). Retrieved fromhttp://www.epa.gov/air/airtrends/sulfur.html Cities in the early 1800s. (n.d.). Retrieved from http://historycentral.com/NN/America/Cities.html History of mine safety and health legislation. (n.d.). Retrieved from www.msha.gov Reclaiming abandoned mine lands. (n.d.). Retrieved from www.osmre.gov Russell, S. (2012, April 12). Smog limit laws. Retrieved from www.ehow.com Title IV: Acid Deposition Control.” (2011, April 12) Clean Air Act, United States. The Earth Encyclopedia. Retrieved from http://www.eoearth.org/article/Clean_Air_Act,_United_States#gen4 Government and public health. (2012). Retrieved from http://www.bbc.co.uk/bitesize/standard/history/1830_1930/public_health/revision/3/