INDIAN STANDARD SUBSURFACE EXPLORATION BY PITS, TRENCHES, DRIFTS AND SHAFTS-CODE OF PRACTICE. IS 445
BUREAU OF INDIAN STA
INDIAN STANDARD SUBSURFACE EXPLORATION BY PITS, TRENCHES, DRIFTS AND SHAFTS-CODE OF PRACTICE. IS 445 - 2nd rev. ed. 2009 - NEW DELHI BUREAU OF INDIAN STANDARDS. - 9
PITS, TRENCHES, DRIFTS AND SHAFTS-CODE OF PRACTICE
624 / BUR
INDIAN STANDARD SUBSURFACE EXPLORATION BY PITS, TRENCHES, DRIFTS AND SHAFTS-CODE OF PRACTICE. IS 445 - 2nd rev. ed. 2009 - NEW DELHI BUREAU OF INDIAN STANDARDS. - 9
PITS, TRENCHES, DRIFTS AND SHAFTS-CODE OF PRACTICE
624 / BUR