00366nam a2200145Ia 4500008004100000020001500041082001300056100001500069245004200084250000800126260003100134300001300165500002400178650001800202230524s9999    xx            000 0 und d  a8121915473  a628bDUG  aK.N.Duggal 0aElements of Environmental Engineering  a1ST  aNEW DELHIb"S,Chand"c2007  aXVII;429  aQuantity Number:  9  aEnvironmental