000			00424nam a2200181Ia 4500
008			201023s9999||||xx |||||||||||||| ||und||
020			_a9788189928353
100			_aCharnjeet Singh
245		0	_aOperating System
250			_a1st
260			_aNew Delhi _bKalyani _c2014
300			_a8.98
365			_b295
650			_aComputer Science.
942			_cTB
999			_c3859 _d3859