000 00317nam a2200121Ia 4500
008 220120s9999||||xx |||||||||||||| ||und||
100 _a alling, William
_912852
245 0 _aOperating sy ems
250 _a2nd
260 _aTata mcgraw hill company Ltd
_bNew Delhi
_c2006
300 _a650
_b220
650 _aHUMANITIES
999 _c132428
_d132428