000			00340nam a2200133Ia 4500
008			230312s9999||||xx |||||||||||||| ||und||
082			_a005.43 _bRIT
100			_aRitchie Colin
245		0	_aOperating Systems
300			_a277
546			_aEng.
650			_aComputer _vWhat is Operating system ? Program Loading Bootstraping
942			_cBK
999			_c2942 _d2942