[THE CHRONIC BRONCHITIS OF COAL MINERS].
D001699:Biometry; D001991:Bronchitis; D029481:Bronchitis, Chronic; D003031:Coal; D003032:Coal Mining; D006801:Humans; D007564:Japan; D009784:Occupational Diseases; D013223:Statistics as Topic
D003031:Coal
BRONCHITIS; COAL MINING; JAPAN; OCCUPATIONAL DISEASES; STATISTICS