000 00274nam a2200121Ia 4500
008 220201s1992 xx 000 0 eng d
100 _aRao & Rao
245 0 _aAir pollution
250 _a3
260 _bNew Delhi : Tata Mc Graw hill
_c1992
300 _a340
942 _2ddc
999 _c85250
_d85250