Appropriate technology for water supply and sanitation technical and economic options Kalbermatten, John M. creator text xxu S.l.] World Bank 1980 monographic eng
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134 p. John M Kalbermatten. Appropriate technology for water supply and waste disposal http://www.amazon.com/exec/obidos/ASIN/B0006XTRCI/chopaconline-20 http://www.amazon.com/exec/obidos/ASIN/B0006XTRCI/chopaconline-20 140916 20140916180925.0 ASINB0006XTRCI