00247nam a2200109Ia 4500008004100000041000800041082002500049100001400074245003200088260000900120300000800129211209s1977    xx            000 0 und d  aeng  a621.4021 N77 GUP/RAJ  aGUPTA G P  aENGINEERING THERMODYNAMICS   c1977  a953