00315nam a2200109 a 4500008004100000050001500041100002300056245003500079246007300114260000900187350000900196120416s1982    xx |||||||||||||| ||    u  aTD 430 Man  aMann, Henry Thomas10aWater treatment and sanitation  aa handbook of simple methods for rural areas in developing countries  c1982  a0.00