00256nam a2200097Ia 4500008004100000082001600041100003600057245002100093260003300114300001100147240817s9999    xx            000 0 und d  a628.3 I23,s  aGordon Maskew Fair and Imhoff F 0aSewage treatment  c1956a New Yorkb Jone Wiley  a338 p.