Kyūryō hiyōsha no shūgyō jikan mondai ni kansuru shiryō
Series: Chōsa hōkoku -- dai 18-shū; Chōsa hōkoku (Nihon Kōgyō Kurabu) -- dai 18-shū.
Publisher: Nihon Kōgyō Kurabu Chōsaka
Published: 1930
Place of publication: Tōkyō
Language: jpn
Number of pages: 102
Subjects: Hours of labor
Notes: Cover title.