000			nam a22 7a 4500
999			_c10156 _d10156
005			20180511144922.0
008			180511b xxu||||| |||| 00| 0 eng d
100			_aSingh,Shailendra Narayan
245			_aConcept of Operating System
250			_a1st
260			_aNew Delhi _bArihant _c2010
300			_axiv, 150 p.
942			_2ddc _cDB