00279nam a2200121Ia 450000500170000000800410001704100080005808200130006610000170007924500320009626000200012830000090014820260720174717.0260720s1979    xx            000 0 und d  aeng  a500 DASE  aDasgupta R N  aExploring Science Book VIII  aNew Delhic1979  a248p