00294nam a2200121Ia 4500008004100000100002800041245003400069260002300103300001000126650001200136942000700148999001700155190216s9999||||xx |||||||||||||| ||und||  aLal Kc 
 Ahmad S I 2aA Text Book Of Modern Physics  bS Chand & Coc1969  a368 p  aPhysics  cBK  c33133d33133