Parra, C. de la

Requena, L.F. & de la Parra, C., 1990. Environmental assessment of the public services improvement project component III - water supply, sanitation and health : El Salvador, (Wash field report no. 299) Arlington, VA, USA: Water and Sanitation for Health Project (WASH). Available at: http://fr.ircwash.org/sites/default/files/827-SV90-7129.pdf.