00301nam a2200121Ia 4500008004100000041000800041082002000049100001000069245004300079250001000122260003900132300000800171211209s1980    xx            000 0 und d  aeng  a628 N80 SIN/GUR  aSINGH  aWATER SUPPLY AND SANITARY ENGINEERING   a2 ed.  aDELHIbSTANDARD PUBLICATIONSc1980  a548