00319nam a2200133Ia 4500008004100000020001500041041001200056082001600068100001600084245002900100260003600129300000800165650001200173221030s9999    xx            000 0 und d  a8121909090  aEnglish  a105.23bAro  aC. L. Arora 0aB. Sc. Practical Physics  bS. Chand & Co.aNew Delhic1998  a629  aPhysics