000 00280nam a2200121Ia 4500
008 211209s1979 xx 000 0 und d
041 _aeng
082 _a628.4 N79 BIR
100 _aBIRDI G S
245 _aWATER SUPPLY AND SANITARY ENGINEERING
260 _c1979
300 _a670
999 _c12731
_d12731