S. Mesfin,
«Constructing and operating treatment plants», in
Infrastructure, environment, water and people : proceedings of the 17th WEDC Conference, United Nations Centre for Human Settlement (Habitat), Nairobi, Kenya, 19-23 August 1991, 1991, pp. P. 139-142: 3 fig., 1 tab.
C. Chibi,
«Design and performance of a community-level iron removal plant»,
Waterlines, an international journal of water, sanitation and waste, pp. p. 9-10: 2 fig., 2 tab., photogr., 1991.
P. P. Mowli,
«Drumstick seed as a coagulant», 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, pp. P. 131-134: 1 fig., 2 tab.
M. R. Collins, Eighmy, T. T., y Malley, J. P.,
«Evaluating modifications to slow sand filters»,
Journal American Water Works Association, pp. p. 62-70: 7 fig., 5 tab., photogr., 1991.
G. J. Alaerts, Buiteman, J. P., y Rahman, S. S. A.,
«Use of Indonesian flocculating soil in water treatment»,
Water supply : the review journal of the International Water Supply Association, pp. p. S95-S101: 6 fig., 5 tab., 1991.