TY  - BOOK
ED  - Indian standards institution                                                                                                                                                                                                                                   . 
TI  - Method for the determination of unconfined compressive strength of rock materials    IS:9143-1979 / 
U1  - 624.121 
PY  - 1979///
CY  - New Delhi : 
PB  - Indian standards institution , 
ER  -