000 00284nam a2200121Ia 4500
008 211209s1980 xx 000 0 und d
041 _aeng
082 _a628 N80 GUR
100 _aGURCHARAN SINGH
245 _aWATER SUPPLY AND SANITARY ENGINEERING
260 _c1980
300 _a448
999 _c15835
_d15835