000 00293nam a2200121Ia 4500
008 211209s1971 xx 000 0 und d
041 _aeng
082 _a628.1 N71 GOR/MAS
100 _aGORDON
245 _aELEMENTS OF WATER SUPPLY AND WASTE WATER DISPOSAL
260 _c1971
300 _a752
999 _c14490
_d14490