L. K. National W. Ratmalana,
Ground water, vol. no. D4. Ratmalana, Sri Lanka: National Water Supply and Drainage Board, 1988, p. ii, 53 p.: fig.
L. K. National W. Ratmalana,
Guidelines for latrine selection and construction, vol. no. D6. Ratmalana, Sri Lanka: National Water Supply and Drainage Board, 1988, p. iv, 61 p.: fig., tab.
L. K. National W. Ratmalana, LK, K. (Region)., and Eschborn, D. E. G. T. Z. -,
“VLOM pump OTC - system”. German Agency for Technical Cooperation, Eschborn, Germany, p. 15 p.: photogr., 1988.