00318nam a2200121Ia 4500008004100000100000900041245005000050260005100100300000900151650001200160942000700172999001700179190216s9999||||xx |||||||||||||| ||und||  aNull 0aPhysics In India Challenges And Oppertunities  bNational Council Of Educational Researchc1970  a322p  aPhysics  cBK  c32811d32811