00320nam a2200133Ia 4500008004100000041001200041082001600053100001600069245003100085260003700116300000800153650001200161700001300173221030s9999    xx            000 0 und d  aEnglish  a105.23bGup  aS. L. Gupta 0aConcepts Of Modern Physics  bDhanpat Rai PubaNew Delhic1999  a628  aPhysics  aS. Gupta