Wall, R.E.

Tomaro, J.B. & Wall, R.E., 1991. Technical assistance to the African Development Bank : development of guidelines for project preparation and appraisal in water supply and sanitation, (Wash field report no. 333) Arlington, VA, USA: Water and Sanitation for Health Project (WASH). Available at: https://es.ircwash.org/sites/default/files/202.5-91TE-8434.pdf.