00301nam a2200121 a 450000500170000002000150001708200170003210000180004924500330006726000370010030000270013770000150016420251203110853.0  a8178000849  a577.276bTRI  aTrivedy, R.K.  aIntrduction to air pollution  aHyderabadbBS Publicationsc2005  axii, 284p.c24 cm.bHB  aGoel, P.K.