TY  - BOOK
AU  - Indian Standards Institution
TI  - Indian standard code of practice for exploration by pits, trenches, drifts and shafts: sub-surface exploration sectional committee, BDC 49
U1  - IS:4453-1967 624.15 I.S.I. 
PY  - 1968///
CY  - Indian Standards Institution, New Delhi
ER  -