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Continue to ChatIS 383 -1970, Reaffirmed 1997 https://civilengineer.co.in/indian-standard-codes/download-is-383-1970-reaffirmed-1997-civil-engineer/attachment/383/
IS 383 -1970, Reaffirmed 1997 https://civilengineer.co.in/indian-standard-codes/download-is-383-1970-reaffirmed-1997-civil-engineer/attachment/383/