TY  - BOOK
T1  - Ruhr kōgyō tiiki iishī no shinzōbu
A2  - Dege, Wilhelm
A2  - Sasaki, Hiroshi
LA  - Japanese
LA  - German
PP  - Tōkyō
PB  - Ninomiya Shoten
YR  - 1981
UL  - http://glotrec.wdi-staging.gei.de/cat/Record/gei737263229
KW  - Coal mines and mining : Germany : Ruhr (Region)
KW  - Ruhr (Germany : Region) : Economic conditions
KW  - Ruhr (Germany : Region) : Social conditions
KW  - Schulbuch
ER  -