TY  - BOOK
AU  - Goldberg,I.S.
TI  - Bitumes naturels de l'U.R.S.S. (formation et répartition)
T2  - 19th International Navigation Congress London 1957
PY  - 1981///
CY  - Leningrad
PB  - Nedra
KW  - Conferences - Meetings
ER  -