TY  - BOOK
AU  - Singh,B.
ED  - International Symposium on Underground Engineering
ED  - Central Mining Research Station (Dhanbad, India).
TI  - International symposium on underground engineering: proceedings 
SN  - 9061919274 (v.1)
PY  - 1989///
CY  - Rotterdam
PB  - A.A. Balkema
KW  - Underground construction
KW  - Underground areas
ER  -