00241nam a2200109Ia 4500008004100000041000800041082001900049100001700068245002900085260000900114300000800123211209s1975    xx            000 0 und d  aeng  a671.52 N75 GON  aGONZALES R F  aINTRODUCTION TO WELDING   c1975  a315