000 00267nam a2200121Ia 4500
654 _aCIVI
100 _aArdern, E.
245 _aActivated Sluge : Process Of Sewerage Purification
260 _bHBLC
_c1949
082 _bARD
300 _a283p.
999 _c19616
_d19616
300 _c23 cm.
655 _aC-12
041 _aeng
546 _aText in English