title: Technology for water supply and sanitation in developing countries. Report of a WHO Study Group.
mesh_terms: D003906:Developing Countries; D004059:Diffusion of Innovation; D006801:Humans; D012499:Sanitation / Q000379:methods; D012722:Sewage; D013672:Technology; D014881:Water Supply / Q000592:standards*
chemical_list: D012722:Sewage