000 00238nam a2200097Ia 4500
008 161222s9999 xx 000 0 und d
100 _aM.N. Rao
245 _aAir pollution
_cM.N. Rao
260 _bTata Mcgrow Hill
_c1989
700 _a H.V.N. Rao
999 _c1430
_d1430