Chronic bronchitis and coalmining in the United Kingdom.
D001991:Bronchitis / Q000209:etiology*; D003032:Coal Mining; D004391:Dust; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000209:etiology*; D009784:Occupational Diseases / Q000209:etiology*; D012907:Smoking; D006113:United Kingdom
D004391:Dust