title: A clinical, roentgenological, and physiological study of magnetite workers.
mesh_terms: D000328:Adult; D000368:Aged; D004562:Electrocardiography; D004781:Environmental Exposure; D006801:Humans; D007501:Iron; D008297:Male; D008875:Middle Aged; D008906:Mining; D010087:Oxides; D011009:Pneumoconiosis / Q000000981:diagnostic imaging / Q000453:epidemiology*; D011859:Radiography; D012129:Respiratory Function Tests; D012822:Silicon Dioxide; D012907:Smoking; D013997:Time Factors
chemical_list: D010087:Oxides; D012822:Silicon Dioxide; D007501:Iron