IS : 2720 Pt XII 1981
Bureau of Indian Standard
IS : 2720 Pt XII 1981 - 1st - New Delhi Bureau of Indian Standard 1991 - 39
Civil Engineering
624 / BU-I
IS : 2720 Pt XII 1981 - 1st - New Delhi Bureau of Indian Standard 1991 - 39
Civil Engineering
624 / BU-I
