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K. B. Kurup,
“Innovative approaches in water supply and sanitation programme”. Kerala Water Authority, Socio-Economic Units, Trivandrum, India, p. 12 p., 1990.
S. C. Reed,
Natural systems for wastewater treatment, vol. FD-16. Alexandria, VA, USA: Water Pollution Control Federation, 1990, p. v, 270 p.: fig., tab.
IDRC -Ottawa, Ont., CA, International Development Research Centre and IRC International Water and Sanitation Centre, The Hague, NL,
Pompes a main : questions relatives aux programmes d'approvisionnement en eau des collectivites rurales, vol. no. 25. The Hague, The Netherlands: IRC, 1990, p. xiii, 202 p.: fig., tab., photogr.
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.
M. Woodhouse,
“Shallow well construction techniques in Kibwezi, Kenya”. African Medical and Research Foundation (AMREF), Nairobi, Kenya, p. 9 p.: 7 fig., 1990.
E. Nissen-Petersen and Lee, M.,
“Shallow wells with bucketlift”, vol. no. 4. ASAL Rainwater Harvesting, Nairobi, Kenya, p. 26 p.: fig., 1990.
E. Nissen-Petersen,
“Small earth dam built by animal traction”, vol. no. 2. ASAL Rainwater Harvesting, Nairobi, Kenya, p. 27 p.: fig., 1990.