004620000a22001450004500003000900000005001700009020001800026245008500044264009400129300000900223490004400232041000800276650001700284650001500301PH-MaWHO20241108112058.0  a92-9022-173-9  aLow-cost water supply and sanitation technology : pollution and health problems.  aNew Delhi : bWorld Health Organization (WHO) Regional Office for South-East Asia,c1984.  a40p.  a(SEARO regional health papers ; no. 4).  aeng  aWater supply  aSanitation