TY  - BOOK
AU  - Sarkar,S.K.
AU  - Mukherjee,K.P.
AU  - Singh,B.
ED  - Central Mining Research Station
TI  - Strate control observations at a longwall face-no.1
U1  - 622.(54) 
PY  - 1967///
CY  - Dhanbad
PB  - Central Mining Research Station
ER  -