J. Kluck,
« Above ground stormwater drainage in an urban area ». Delft University of Technology, Dept. of Sanitary Engineering and Water Control, Delft, The Netherlands, p. 33 p. + 82 p. annexes: fig., tab., 1991.
M. B. Degen, Reneau, R. B., Hagedorn, C., et Martens, D. C.,
« Denitrification in onsite wastewater treatment and disposal systems », vol. no. 171. Virginia Water Resources Research Center, Blacksburg, VA, USA, p. xii, 113 p. : fig., tab., 1991.
V. P. Mnyanga,
« Ground water contamination by pit latrines : Dar-es-salaam (Manzese squatter area) case study », vol. no. 39. IHE (International Institute for Infrastructural, Hydraulic and Environmental Engineering), Delft, The Netherlands, p. 115 p.: fig., tab., 1991.
M. Detay, Poyet, P., et Brisson, E.,
« Hydrolab : le systeme expert d'aide a l'implantation de forages : concepts, techniques et application au Burkina Faso ». Comite Interafricain d'Etudes Hydrauliques (CIEH), Ouagadougou, Burkina Faso, p. 120 p. : 34 fig., 5 tab., 1991.
C. C. Mbigha et Nalluri, C.,
« Mathematical simulation of reciprocating handpump performance »,
Aqua : journal of water supply research and technology, p. p. 281-290: 10 fig., 1 tab., 1991.
A. P. Cotton et Franceys, R. W. A.,
« Optimizing infrastructure », in
Infrastructure for low-income communities : proceedings of the 16th WEDC conference : Regional Centre for Urban and Environmental Studies (RCUES), Osmania University, Hyderabad, India, 27-31 August, 1990, 1991, p. p. 47-50: 3 fig.
L. Lovei et Whittington, D.,
« Rent seeking in water supply : discussion paper ». World Bank, Water and Sanitation Division, Washington, DC, USA, p. 25 p.: 4 fig., 2 tab., 1991.
R. Ramasubban, Singh, B., Bhatia, R., Griffin, C. C., Kim, C., et Briscoe, J.,
« Rural water supply in Kerala, India : how to emerge from a low-level equilibrium trap ». Urban Institute, Washington, DC, USA, p. 47 p.: 3 fig., 11 tab., 1991.
B. Hydbom,
« Step draw-down pumping test », vol. no. 4. UNICEF, Copenhagen, Denmark, p. 14 p.: fig., 1991.