IS:4097-1967. Indian standard specification for gravel for use as pack in tubewells.
Bureau of Indian Standards[BIS]
IS:4097-1967. Indian standard specification for gravel for use as pack in tubewells. - New Delhi Bureau of Indian Standards 1992 - 5p.
IS CODE / B.I.S
IS:4097-1967. Indian standard specification for gravel for use as pack in tubewells. - New Delhi Bureau of Indian Standards 1992 - 5p.
IS CODE / B.I.S