000			00252nam a2200109Ia 4500
082			_a005.43
245			_aI.B.M. using disk operating system. Version 4
260			_aDelhi _bIBM Corporation _c1988
300			_ax; 155p.
890			_aIndia
942			_2ddc
999			_c15393 _d15393
650			_aOperating systems (Computers)