UNDTCD -New York, NY, US,
Ground water in Western and Central Europe, vol. no. 27. New York, NY, USA: United Nations, 1991, p. xxvi, 363 p.: 71 fig., 62 tab.
UNDTCD -New York, NY, US,
«Integrated water resources planning». United Nations Department of Technical Co-operation for Development, New York, NY, USA, p. iii, 128 p.: fig., tab., 1991.
UNDTCD -New York, NY, US,
«Legislative and economic approaches to water demand management». United Nations DTCD,Water Resources Branch, New York, NY, USA, p. vi, 58 p.: 1 tab., 1991.
UNDP -New York, NY, US y UNDTCD -New York, NY, US,
«Schema directeur pour le secteur eau et assainissement». UNDP (United Nations Development Programme), New York, NY, USA, p. 2 vol. (vi, 98 p ; ca. 120 p.): fig., tab., maps, 1991.
UNDTCD -New York, NY, US,
«Water management since the adoption of the Mar del Plata Action Plan : lessons for the 1990's». United Nations Department of Technical Co-operation for Development, New York, NY, USA, p. iv, 33 p.: 5 tab., 1991.
I. T. I. L. O. - Turin, IRC International Water and Sanitation Centre, The Hague, NL, Domingo, D. O. I. N. S. T. R. A. W. - S., y UNDTCD -New York, NY, US,
«Women, water supply and sanitation (WWSS)». United Nations International Research and Training Institute for the Advancement of Wpmen (INSTRAW), Santo Domingo, Dominican Republic, p. 4 vol.: fig., cassettes, slides, tab., and transparency texts, 1991.