00405nam a2200133Ia 4500008004100000041000800041082001400049100003000063245009500093250000800188260004700196300000600243650002200249230711s9999||||xx |||||||||||||| ||und||  aENG  a624bBU-I  aBureau of Indian Standard 0aSI : 6922 1973bCriteria for safety and design of structures subject to underground blasts  a1st  c1973aNew DelhibBureau of Indian Standard  a8  aCivil Engineering