00297nam a2200109Ia 450000500170000000800410001708200140005810000180007224500490009026000400013930000080017920260224041042.0260224s9999||||xx |||||||||||||| ||und||  a628.1 HAM  aHammer, M.J.  0aWater and wastewater technology : SI version  aNew York: John Wiley & Sons. c1986  a536