Effects of exposure to slate dust in North Wales.
D006801:Humans; D009784:Occupational Diseases / Q000453:epidemiology*; D011009:Pneumoconiosis / Q000453:epidemiology* / Q000209:etiology; D012959:Socioeconomic Factors; D014397:Tuberculosis, Pulmonary / Q000150:complications / Q000453:epidemiology*; D014852:Wales