00312nam a2200121Ia 4500008004100000041000800041082001400049100003000063245002000093250000800113260004700121650002200168230711s9999||||xx |||||||||||||| ||und|| aENG a624bBU-I aBureau of Indian Standard 0aIS : Gr 11 1981 a1st c1981aNew DelhibBureau of Indian Standard aCivil Engineering