00255nam a2200109Ia 4500008004100000041000800041082001900049100001300068245002500081260003100106300000800137211209s1977    xx            000 0 und d  aeng  a620.23 N77 PUJ  aPUJARA K  aNOISE FOR ENGINEERS   bDHANPAT RAI AND SONSc1977  a149