1. 2016. Mine safety and health at a glance. Department of Labor Mine Safety and Health Administration. https://www.msha.gov/data-reports/statistics/mine-safety-and-health-glance 2016. Mine safety and health at a glance. Department of Labor Mine Safety and Health Administration. https://www.msha.gov/data-reports/statistics/mine-safety-and-health-glance
2. 2017. Sampling and Compliance Overview - MSHA’s Final Rule to Lower Miners’ Exposure to Respirable Coal Mine Dust. Mine Safety and Health Administration (MSHA). https://arlweb.msha.gov/endblacklung/docs/samplingandcompliance.pdf 2017. Sampling and Compliance Overview - MSHA’s Final Rule to Lower Miners’ Exposure to Respirable Coal Mine Dust. Mine Safety and Health Administration (MSHA). https://arlweb.msha.gov/endblacklung/docs/samplingandcompliance.pdf
3. December 2016. US coal miners hit by sharp rise in deadliest black lung disease. International Committee of the Fourth International (ICFI). https://www.wsws.org/en/articles/2016/12/19/wvbl-d19.html December 2016. US coal miners hit by sharp rise in deadliest black lung disease. International Committee of the Fourth International (ICFI). https://www.wsws.org/en/articles/2016/12/19/wvbl-d19.html