Honpō ni okeru saitan nōritsu ni kansuru shiryō
Series: Kōgyō ritchi jōken chōsa shiryō
Publisher: Mantetsu] Tōkyō Shisha Chōsashitsu
Published: 1940
Place of publication: [Tokyo
Language: jpn
Number of pages: 11
Subjects: Coal mines and mining
Notes: Cover title.

Confidential document (stamped).