J. Pickford,
“Affordable water supply and sanitation : proceedings of the 20th WEDC conference, Colombo, Sri Lanka, 22-26 August 1994”. Water, Engineering and Development Centre, Loughborough University of Technology, WEDC, Loughborough, UK, p. xvii, 325 p.: fig., tab., 1994.
S. Gabbay,
“The environment in Israel”. Israel, Ministry of the Environment, Jerusalem, Israel, p. xiii, 255 p. : fig., tab., 1994.