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W. Schramm y Gurung, L. B.,
«Proposal for a feasible maintenance and repair management of rural community water supply based on present state of the Western Development Region». Nepal, Ministry of Panchayat and Local Development, Regional Directorate, Pokhara, Nepal, p. vii, 90 p.: fig., tab., 1981.
H. Shipman,
«Report on the Peru Water Systems and Environmental Sanitation Project», vol. no. 6. Water and Sanitation for Health Project (WASH), Arlington, VA, USA, p. 8, ((14)) p., 1981.
P. H. National W. City,
«Rural water supply. Vol. II : Construction and installation manual». National Water Resources Council, Quezon City, The Philippines, p. xiii, 241 p.: fig., tab., 1981.
IRC International Water and Sanitation Centre, The Hague, NL,
«Slow sand filtration for community water supply in developing countries : report of an international appraisal meeting held in Nagpur, India : September 15-19, 1980», vol. no. 16. IRC, The Hague, The Netherlands, p. 64 p. : tab., photogr., 1981.
R. H. Thomas y Arbuthnot, J.,
«Village water supply and sanitation in Northeast Thailand», vol. no. 19. Water and Sanitation for Health Project (WASH), Arlington, VA, USA, p. x, 86 p., 1981.