000			00363nam a2200145Ia 4500
008			230106s9999 xx 000 0 und d
082			_a4 _bRI-O
100			_aRitchie.Dennis M
245		0	_aOperating system : unix and window
250			_a1st Ed.
260			_aNdew Delhi _bBPB Publications _c1998
300			_a277
650			_aComputer Engineering
942			_cBK
999			_c773 _d773