00286nam a2200121Ia 4500008004100000082000800041082001000049100001600059245003500075260001400110260003100124260000900155230118s9999||||xx |||||||||||||| ||und||  a539  bDUG/C  ab.dbduggal 0afundementals of modern physics  ajalandhar  bshoban lal nagin chand &co  c1986