Sansei-shō Daidō tanden nenketsuseitan oyobi ganʼen chōsa keikaku
Publisher: Mantetsu Chōsabu Chōsayaku
Published: 1939
Place of publication: [Dairen]
Language: jpn
Number of pages: 10
Subjects: Rock salt; Coal; Coke; Carbonization
Notes: Cover title.

Confidential document (stamped).