000 00282nam a2200121Ia 4500
008 191031s9999 xx 000 0 und d
100 _aBorron (DW)
245 0 _aComputer operating system
260 _b"Chand & Co, New Delhi"
260 _c1971
365 _b36.52
942 _cBK
999 _c201847
_d201847