[Fourfold direct enlargement radiographs of the lungs in healthy and in early silicotic subjects].
D006262:Health; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging*; D013902:Radiography, Thoracic; D012829:Silicosis / Q000000981:diagnostic imaging*
LUNG/radiography; SILICOSIS/radiography