Biblio

USAID -Washington, DC, US, “Point-of-use water treatment studies and reports published from January – July 2007”. USAID, Washington, DC, USA, p. 9 p., 2007.

USAID -Washington, DC, US, “Constructing a household sand filter”, vol. no. RWS.3.C.1. USAID, Washington, DC, USA, p. 4 p.: 4 fig., 1 tab., 1982.

USAID -Washington, DC, US, “Designing basic household water treatment systems”, vol. no. RWS.3.D.1. USAID, Washington, DC, USA, p. 8 p.: 3 fig., 2 tab., 1982.

USAID -Washington, DC, US, “Operating and maintaining household treatment systems”, vol. no. RWS.3.O.1. USAID, Washington, DC, USA, p. 4 p.: 3 fig., 1982.