00381nam a2200121Ia 450000500170000000800410001708200160005810000580007424500620013226000270019430000150022165000230023620240821160210.0240821s9999||||xx |||||||||||||| ||und||  a530 NAT(TB)  aNational Council of Educational Research and Training 0aPhysics : a textbook for secondary schools : classes IX-X  aNew DelhibNCERTc1975  axii, 140p.  aPhysics - Textbook