00273nam a2200121Ia 4500008004100000082000800041082001000049100002000059245002800079260001300107260002200120260000900142230118s9999||||xx |||||||||||||| ||und||  a539  bGUP/M  asatish kbgupta 0amodern's abc of physics  anewdelhi  bmodern publishers  c1990