Bujun Tankō Manjin jūjiin gentai chōsa
Subtitle: [Kōji Jimusho, Un'yu Jimusho, Sōmukyoku kankei, Kōmukyoku, Kōgyōkyoku, Saitankyoku no bu]
Publisher: Bujun Tankō Sōmukyoku Shomuka Chōsagakari
Published: 1941
Place of publication: [Bujun
Language: jpn
Number of pages: 30
Subjects: Industrial relations; Coal miners