00418nam a2200121Ia 450000500170000000800410001702000220005805000160008010000140009624501130011026000270022365000460025020251229172111.0251229s9999    xx            000 0 und d  a978-0-903031-23-3  aTD 430 .M33  aMann, H.T 0aWater treatment and sanitationba handbook of simple methods for rural areas in developing countriescH Mann  aNottinghamb ITPc1982  aWater-Purification- Handbooks,Manuals Etc