000 00283nam a2200109Ia 4500
008 190516s9999 xx 000 0 und d
100 _aGURJEET SINGH& OTHERS
245 0 _aOPERATING SYSTEM A CONCEPT BASED APP.
260 _c2012
_bND UDH PUB.&DISTBUTER
300 _a494
942 _cBK
999 _c17278
_d17278