00291nam a2200109Ia 4500008004100000041000800041082001900049100002000068245004100088260004400129300000800173211209s1999    xx            000 0 und d  aeng  a005.44 N99 BAC  aBACH, MAURICE J  aDESIGN OF THE UNIX OPERATING SYSTEM   aNEW DELHIbPRENTICE-HALL OF INDIAc1999  a471