00501nam a2200181Ia 4500008004100000041001200041082001100053100002000064100001100084245003600095260001200131260003000143260000900173300001500182365002500197440007300222650002400295150909s9999    xx            000 0 und d  aEnglish  bSCH/WA  aSchroeder E D    eAuthor  aWater and waste water treatment  aNewYork  bMc Graw Hill Book company  c1977  a370  Pages  aUSD.21.50             aMc Graw Hill series in water resources and environmental engineering  aSewage purification