Chūsei Hokudō yōran. Chūshū kansatsushi. Chūshū hattenshi忠淸北道 (Korea) · First published 1989Open the Tome
Chūshū kigyō no rōmu kanri to rōshi kankeiTōkyō Toritsu Rōdō Kenkyūjo · First published 1980Open the Tome