00266nam a2200109 a 450000500170000000800410001702000150005824500330007326000200010699900170012604000130014320200930073705.0111004s1993                  000   spa d  a0135881870 0aSistemas oerativos modernos.  aToronto,c1993.  c33910d33910  aDO-SdBNP