000 00248nam a2200109Ia 4500
008 220201s9999 xx 000 0 eng d
100 _aRATTAN (SUNITA)
245 0 _aENGINEERING CHEMISTRY
250 _a2ND
260 _bS. K. KATARIA
942 _2ddc
999 _c98447
_d98447