1990
PAHO -Washington, DC, US,
“Efficient use and optimization of drinking water services”, in
Regional conference on water supply and sanitation : evaluation of the International Drinking Water Supply and Sanitation Decade and projections towards the year 2000, Puerto Rico, 4-6 September de 1990, 1990, p. 11 p.
C. O. Suna- Hisca Bogota,
“El agua y la salud”. Chusos, Bogota, Colombia, p. 42 p.: drawing, 1990.
“Enterprise development and microfinance”. Practical Action Publishing, London, UK, 1990.
R. Goodland,
“Environmental aspects of dam and reservoir projects : the World Bank's new policy”,
Waterlines, an international journal of water, sanitation and waste, pp. 7-10: photogr., 1990.
L. F. Requena en de la Parra, C.,
“Environmental assessment of the public services improvement project component III - water supply, sanitation and health : El Salvador”, vol. no. 299. Water and Sanitation for Health Project (WASH), Arlington, VA, USA, p. xii, 97 p.: photogr., 1990.
U. Winblad en Nordberg, E.,
“Environmental hygiene in SIDA-supported programmes in Africa : review and recommendations”. SIDA, Swedish International Development Cooperation Agency, Stockholm, Sweden, p. 69 p.: fig., tab., 1990.
M. R. Khan en Gijzen, H. J.,
“Environmental pollution and its management in Eastern Africa : proceedings of a symposium organized by the Faculty of Science, University of Dar es Salaam, Dar es Salaam, September 11-14th, 1989”. University of Dar es Salaam, Faculty of Science, Dar es Salaam, Tanzania, p. viii, 387 p.: fig., tab., map., 1990.
EPA -Cincinnati, OH, US,
“Environmental pollution control alternatives : drinking water treatment for small communities”. US Environmental Protection Agency (EPA), Cincinnati, OH, USA, p. vi, 82 p. : fig., photgr., tab., tech drwngs., 1990.
C. de Jong-Boon,
“Environmental problems in Sudan : a reader”. Institute of Social Studies, Research and Project Office, The Hague, The Netherlands, p. 2 vol. (xxi, 819 p.): fig., map, tab., 1990.
R. Beck,
“Environmental profile Al Bayda Governorate, Yemen Arab Republic”. DHV, Amersfoort, The Netherlands, p. 48 p.: fig., map, photogr., 1990.
R. Beck,
“Environmental profile Dhamar Governorate, Yemen Arab Republic”. DHV, Amersfoort, The Netherlands, p. 48 p. : fig., map, photogr., 1990.
R. Beck,
“Environmental profile Tihama, Yemen Arab Republic”. DHV, Amersfoort, The Netherlands, p. 48 p. : fig., map., photogr., 1990.
World Bank -Washington, DC, US en Luxembourg, L. U. European I.,
The environmental program for the Mediterranean : preserving a shared heritage and managing a common resource. Washington, DC, USA: World Bank, 1990, p. ix, 93 p.: box, map, tab.
J. Hukka,
Environmental sanitation : beyond the Decade : discussion paper, vol. no. 40. Tampere, Finland: Tampere University of Technology, 1990, p. 63 p.: tab.