Biblio

M. Styles and Keating, T., “Water efficient schools : Chesswood Middle school project : final project report”. Southern Water, Worthing, UK, p. 12 p.: fig., tab., 2000.

E. Nissen-Petersen and Lee, M., “Rock catchment dam with self-closing watertap”, vol. no. 3. ASAL Rainwater Harvesting, Nairobi, Kenya, p. 40 p. : fig., 1990.

Y. M. Sternberg and Knight, R., “Endurance tests of robovalves”, vol. no. 102. Water and Sanitation for Health Project (WASH), Arlington, VA, USA, p. i, 26 p., 1983.

Y. M. Sternberg and Knight, R., “Final report on the development and testing of the robovalve”, vol. AID contract AID/ta-c-1461. International Rural Water Resources Development Laboratory, College Park, Maryland, p. 70 p. : 8 fig., 4 tab., 5 app., 1978.