1. https://www.msha.gov/data-reports/statistics
2. 2015 http://www.msha.gov/MSHAINFO/FactSheets/MSHAFCT2.HTM
3. Workplace injuries and illnesses in the extractive industries;McDermott;Compens Work Cond,1997
4. Respiratory diseases caused by coal mine dust;Laney;J Occup Environ Med,2014
5. 2013 http://www.eia.gov/state/rankings/?sid=IL#series/48