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acid air-borne dust alumina aluminium alveoli animals asbestos asbestosis asthma average bagasse beryllium beryllium oxide blood bronchioles bronchitis Bulletin cadmium carbon cause cells cent changes chemical chronic clinical coal miners containing cough cyanosis described developed diagnosis disease dust concentration dyspnoea E. L. Collis E. L. Middleton effect emphysema employed examination experiments exposed exposure factory fibrosis figs films filter foundries free silica fumes given incidence increased Indust industrial infection inhalation investigation iron lesions lungs manganese measures metal method mines nodular nodules occupational occurred oxide pathological patients pneumoconiosis pneumonia powder present produced pulmonary pulmonary fibrosis quartz radiographs radiological reaction refs reported Research respiratory Roodhouse Gloyne samples sericite shadows showed siderosis silica silicosis silicotic solubility South Wales sputum stage symptoms tests Thomas Bedford tion tissue toxic Toxicol tuberculosis tuberculous ventilation welders welding workers X-ray