Appropriate technology for water supply and sanitation :
Kalbermatten, John M.
Appropriate technology for water supply and sanitation : technical and economic options / John M Kalbermatten. - [S.l.] : World Bank, 1980. - 134 p. - Appropriate technology for water supply and waste disposal. . - Appropriate technology for water supply and waste disposal. .
Appropriate technology for water supply and sanitation : technical and economic options / John M Kalbermatten. - [S.l.] : World Bank, 1980. - 134 p. - Appropriate technology for water supply and waste disposal. . - Appropriate technology for water supply and waste disposal. .