00327pam a2200145a 44500008004100000020000900041041001200050082000900062100002100071245002200092250000600114260004400120300000800164650000900172230515b1989    xxu||||| |||| 00| 0 eng d  aNULL  aENGLISH  aN.D.  aTanembaum Andrew  aOperating systems  a0  aNULLbPrintice Hall Of India Ltd.c1989  a719  aNULL