Question to answer requires valid data.
P G
PG
Tuteur
D003031:Coal / Q000009:adverse effects*; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000401:mortality*; D008906:Mining; D009784:Occupational Diseases / Q000401:mortality; D011009:Pneumoconiosis / Q000401:mortality*; D014481:United States / Q000453:epidemiology
D003031:Coal