TATSUYA KIUCHI, HACHIRO OHTAKE, YASUHEI FUKUDA, YUTAKA MAEDA, TADAO KURIHARA, YUTAKA HOSODA, MASARU HAYASHI, YOSHIBUMI NAKANO, TAKAHISA SUGISHITA. (1975). Pneumoconiosis in raílway workers and the practicability of the 1971 ILO U/C internationai classification of radiographs of pneumoconiosis