00270nam a2200109Ia 4500008004100000041000800041082001900049100001200068245003700080260003500117300000800152211209s1979    xx            000 0 und d  aeng  a671.52 N79 HOR  aHORWITZ  aWELDING PRINCIPLES AND PRACTICE   bHOUGHTON MIFFLIN COMPANYc1979  a797