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041 _a  ENGLISH
082 _a624
082 _bBUR
100 _aBUREAU OF INDIAN STA
245 0 _aINDIAN STANDARD SUBSURFACE EXPLORATION BY PITS, TRENCHES, DRIFTS AND SHAFTS-CODE OF PRACTICE. IS 445
250 _a2nd rev. ed.
250 _b2009
260 _aNEW DELHI
260 _bBUREAU OF INDIAN STANDARDS.
300 _a9
650 _a  PITS, TRENCHES, DRIFTS AND SHAFTS-CODE OF PRACTICE
942 _cREF
999 _c151256
_d151256