00255nam a2200109Ia 4500008004100000041000800041082001800049100001800067245004300085260000900128300000800137211209s1973    xx            000 0 und d  aeng  a621.8 N73 PEA  aPEATFIELD A E  aTEACH YOURSELF MECHANICAL ENGINEERING   c1973  a207