00302nam a2200109Ia 4500008004100000082002400041100002000065245005100085250000900136260003800145300000900183240913s9999||||xx |||||||||||||| ||und||  aGS    005.43  CRO/O  aCrowley Charles 0aOperating systems : a design oriented approach  aNULL  bTata McGraw HillaNew Delhic1997  a844p