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

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