00351nam a2200133Ia 4500008004100000020001500041041001200056082001700068100001700085245005800102260003500160300000800195650001400203221030s9999    xx            000 0 und d  a8121915473  aEnglish  a105.23bDugg  aK. N. Duggal 0aElements of Enviromental Engineeringcby K. N. Duggal  bS. Chand & CoaNew Delhic1998  a496  aChemistry