00404nam a2200133Ia 450000500170000000800410001702000180005805000200007610000200009624500560011625000120017226000340018465000520021820251229124621.0251229s9999    xx            000 0 und d  a0-08-028705-0  aTD 365 .T4 1983  aTebbutt, T.H.Y. 0aPrinciples of water quality control.cT.H.Y Tebbutt  a3rd ed.  aOxfordb Pergamon Pressc1983  aWater Quality-Kenya-Embu County-Rupingazi River