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Continue to ChatIS-4968 (PART 2)-1976 INDIAN STANDARD METHOD FOR SUBSURFACE SOUNDING FOR SOILS DYNAMIC METHOD USING CONE AND BENTONITE SLURRY. https://civilengineer.co.in/indian-standard-codes/is-4968-part-2-1976-indian-standard-method-for-subsurface-sounding-for-soils-dynamic-method-using-cone-and-bentonite-slurry/