Search Results       Your search for [subject]Developing countries -- Water-supply returned 1 record.           Slow sand filtration: a low cost treatment for water supplies in developing countries. by Pescod, M.B.; Marlow, Bucks: Published for the World Health Organization's Regional Office for Europe by the Water Research Centre, UK, in collaboration with the International Reference Centre for Community Water Supply and Sanitation, The Netherlands. Subject: Water -- Purification -- Filtration; Developing countries -- Water-supply.          Add to Book Cart Relevance: 21.29%