The Miners' Medical Bureau and its policies.
D000293:Adolescent; D000328:Adult; D000368:Aged; D001991:Bronchitis / Q000453:epidemiology / Q000209:etiology; D004391:Dust; D006801:Humans; D008297:Male; D008875:Middle Aged; D008906:Mining; D009784:Occupational Diseases / Q000453:epidemiology; D009786:Occupational Health Services; D012130:Respiratory Hypersensitivity / Q000150:complications / Q000453:epidemiology; D013019:South Africa
D004391:Dust