000 00284nam a2200121Ia 4500
008 230303s9999 xx 000 0 und d
041 _aeng
082 _a540.3 RAT
100 _aRATTAN (SUNITA)
245 _aENGINEERING CHEMISTRY
260 _aNEW DELHI
_bS.K.KATARIA
365 _cRS
999 _c219870
_d219870