000 00295nam a2200121Ia 4500
008 211209s1974 xx 000 0 und d
041 _aeng
082 _a628.5 N74 PER
100 _aPERKINS H C
245 _aAIR POLLUTION
260 _aNEW YORK
_bMCGRAW -HILL BOOK COMPANY
_c1974
300 _a422
999 _c17730
_d17730