1998
L. J. M., Wegelin, M., y G. C., G.,
«La filtracion gruesa en el tratamiento de agua de fuentes superficiales», vol. no. 4/98. SKAT (Swiss Centre for Development Cooperation in Technology and Management), St. Gallen, Switzerland, p. vi, 170 p. : fig., photogr., tab., 1998.
J. T. Visscher, J. M., L., y G. C., G.,
Multi-stage filtration : an innovative water treatment technology, vol. no. 34-E. The Hague, The Netherlands: IRC, 1998, p. xiii, 165 p. : 68 fig., 60 tab.
G. Whitby,
«Primary community school construction»,
Appropriate technology, pp. p. 30-32 : 1 box, 1998.
M. T. Hai,
Water harvesting : an illustrative manual for development of microcatchment techniques for crop production in dry areas, vol. no. 16. Nairobi, Kenya: SIDA, Swedish International Development Cooperation Agency, 1998, p. viii, 54 p. : fig., map, plates, tab.
1997
D. D. Mara,
Design manual for waste stabilization ponds in India. Leeds, UK: Lagoon Technology International, 1997, p. viii, 125 p. : fig., photogr., tab.
N. L. Calorama - Elburg,
«Hand drilled wells», vol. no. 3. Calorama Rural Development Service, Elburg, The Netherlands, p. 65 p. : fig., photogr., tab., tech. drwngs., 1997.
S. H. S. y Tene, C.,
«Letrina MFC - OPS/OMS». Pan American Health Organization (PAHO), Tegucigalpa, Honduras, p. 4 p. : 2 photogr., 2 tab., 1997.
N. L. D. H. V. - Amersfoort, Dhaka, B. D. A. Q. U. A. Consu, y Dhaka, B. D. D. E. V. C. O. Nsult,
«Sanitation (mission 2) : public toilets and community latrines : review and evaluation of existing designs proposals for new design concepts : technical report». DHV, Amersfoort, The Netherlands, p. iv, 50 p. + 19 p. annexews : fig., tab., techn.drwng., 1997.
I. N. Sulabh Int Patna,
«Sulabh international marches from urban to rural areas». Sulabh International, New Delhi, India, p. 7, xxii p. : tech. drwngs., photogr., 1997.
R. Shaw y Pickford, J.,
«Technical brief no. 54 : emptying latrine pits»,
Waterlines, an international journal of water, sanitation and waste, pp. p. 15-18 : ill., 1997.
U. Winblad,
Towards an ecological approach to sanitation, vol. no. 5. Stockholm, Sweden: SIDA, Swedish International Development Cooperation Agency, 1997, p. i, 13 p. : drwngs.