Bergeron, G.

Esrey, S.A. & Bergeron, G., 1993. Baseline survey for the Guatemalan Highlands Rural Water and Sanitation Project, (Wash field report no. 403) Arlington, VA, USA: Water and Sanitation for Health Project (WASH). Available at: https://es.ircwash.org/sites/default/files/827-GT-11152.pdf.