Tokutei kōshō kaihatsu sokushin chōsa hōkoku
Subtitle: funkawan kaitei satetsu kōshō : Hokkaidō kaihatsu keikaku chōsa, kōgyō kaihatsu keikaku chōsa
Publisher: Hokkaidō Kaihatsuchō
Published: 1968
Place of publication: [Sapporo-shi]
Language: jpn
Number of pages: 80
Subjects: Iron mines and mining; Submarine mining