00271nam a2200109Ia 4500008004100000041000800041082002500049100001300074245002700087260003900114300000800153211209s1974    xx            000 0 und d  aeng  a621.4025 N74 PUR/NIG  aPURI A N  aNEW TEXT BOOK OF HEAT   aNEW DELHIbATMA RAM AND SONSc1974  a285