Doyō heichō
Subtitle: shushi to unʼyō hōshin
By: Sōmuchō Jinjikyoku Doyō Heichō Kenkyūkai hen
Edition: Shohan
Publisher: Gakuyō Shobō
Published: 1988
Place of publication: Tōkyō
Language: jpn
Number of pages: 464
Subjects: Hours of labor