000 00258nam a2200109Ia 4500
008 140122s9999 xx 000 0 und d
082 _a614.7 Bhargava
100 _aBhargava Gopal
245 _aPollution and its control
260 _b
_c1992
942 _cBK
_2ddc
999 _c6847
_d6847