00353nam a2200145Ia 4500008004100000084001100041100002000052245002300072250002000095260002500115260000900140260001400149300000900163500003500172180424s9999    xx            000 0 und d  a600 P7  a"Krishnan, K S" 0aNew Era of Science  a\\195700ENGGPSX  aPublication Division  b1957  cNew Dalhi  a45 p  aincludes index and biblioraphy