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2. Drinking water and sanitation in Central America: Challenges, perspectives, and Alternative Water Treatment;Ramírez-Sánchez,2015
3. Recurso Hidrico [Water Source]
http://fonaes.gob.sv/?page_id=555
4. GLAAS 2013/2014 Country Highlights: El Salvador,2015
5. Investing in Water for a Green Economy: Services, Infrastructure, Policies and Management,2013