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Indian standard code of practice for exploration by pits, trenches, drifts and shafts sub-surface exploration sectional committee, BDC 49
Indian Standards Institution
Indian standard code of practice for exploration by pits, trenches, drifts and shafts sub-surface exploration sectional committee, BDC 49 - Indian Standards Institution, New Delhi 1968 - 15
IS:4453-1967 624.15 I.S.I.
Indian standard code of practice for exploration by pits, trenches, drifts and shafts sub-surface exploration sectional committee, BDC 49 - Indian Standards Institution, New Delhi 1968 - 15
IS:4453-1967 624.15 I.S.I.