00294nam a2200121Ia 4500008004100000100001800041245001700059260005100076300000900127650001200136942000700148999001700155190216s9999||||xx |||||||||||||| ||und||  aBhatnagar P L 4aThe Universe  bNational Council Of Educational Researchc1967  a200p  aPhysics  cBK  c32763d32763