Biblio

M. Osola, “A few buckets more : reducing sand invasion and siltation in Angola”, Waterlines, an international journal of water, sanitation and waste, pp. p. 28-29 : 2 boxes, 2 fig., 1 photgr., 1998.

M. R. Collins, Cole, J. O., Westersund, C. M., and Paris, D. B., “Assessing roughing filtration design variables”, Water supply : the review journal of the International Water Supply Association, pp. p. SS 5.29 - 5.40: 9 fig., 11 tab., 1994.

M. Wegelin, “Roughing gravel filters for suspended solids removal”, in Slow sand filtration : recent developments in water treatment technology, 1988, pp. P. 103-122: fig., tab.

L. Di Bernardo, “Upflow coarse-grained prefilter for slow sand filtration”, in Slow sand filtration : recent developments in water treatment technology, 1988, pp. P. 123-140: fig., tab.

L. K. U. N. I. C. E. F. - Colombo, “Iron removal plant : installation and maintenance manual”. UNICEF Water, Environment and Sanitation Section, Colombo, Sri Lanka, p. 11 p.: tech. drwng, photogr., 1987.

K. Bucksteeg, “Sewage treatment in helophyte beds : first experiences with a new treatment procedure”, Water science and technology, pp. p. 1-10 : 7 fig., 1987.

J. N. Kardile, Simple methods in water purification. Nasik, India: Foundation for Simplified Filters, 1987, p. 179 p.: fig., tab.

K. V. Ellis, “Slow sand filtration as a technique for the tertiary treatment of municipal sewages”, Water research, pp. p. 403-410: tab., 1987.

L. Childers and Claasen, F., “UNICEF's upward-flow water filter”, Waterlines, an international journal of water, sanitation and waste, pp. p. 29-31: ill., 1987.

K. E. U. N. I. C. E. F. Reg Nairobi, “The upward flow water filter”. UNICEF Regional Office for Eastern and Southern Africa, Nairobi, Kenya, p. [5] p.: ill., 1987.

B. J. Lloyd, Wheeler, D., and Pardon, M., “Final report on the development, evaluation and field trials of a small scale, multi-stage, modular filtration system for the treatment of rural water supplies”. DelAgua, Lima, Peru, p. 42, 107 p. : fig., tab., 1986.

B. J. Lloyd, Wheeler, D., Pardon, M., and Symonds, C. N., “Aspects of prefiltration concerned with the application of small scale slow sand filtration in rural communities”. University of Surrey, Department of Microbiology, Guildford, UK, p. 112 p.: fig., tab., photogr., 1985.

B. J. Lloyd, Wheeler, D., Pardon, M., and Symonds, C. N., “Progress report (phase II) for the attention of UK Overseas Development Administration : rural water treatment package plant”. Overseas Development Administration (ODA), London, UK, p. 134 p.: fig., 1983.

N. M. Merchant, “Construction of an intermittent water filter for villages in Southern Iran”, Journal of Indian Water Works Association, pp. p. 177-179 : fig., tab., 1976.