TY  - BOOK
ED  - Indian standards institution
TI  - Code of practice for subsurface exploration by pits,trenches,drifts and shafts/1st rev
U1  - 622.142:006.76 
PY  - 1980///
CY  - New Delhi
PB  - Indian standards institution
KW  - IS:4453-1980
ER  -