Biblio

N. Graham and Collins, R., “Advances in slow sand and alternative biological filtration”. Wiley, Chichester, UK, p. xvii, 461 p. : fig., tab., 1996.

K. E. Kemper, The cost of free water : water resources allocation and use in the Curu Valley, Ceara, Northeast Brazil, vol. no. 137. Linkoping, Sweden: Linkoping University, Department of Water and Environmental Studies, 1996, p. 230 p.: fig., tab.

T. Viraraghavan, Subramanian, K. S., and Swaninathan, T. V., Drinking water without arsenic : a review of treatment technologies, vol. no. 37, 1994. Bangkok, Thailand: Environmental Systems Information Center, 1996, p. 35 p.: 14 tab.

C. Bielenberg and Allen, H., How to make and use the treadle irrigation pump. London, UK: IT Publications, 1995, p. x, 77 p.: fig., tab.

P. Schubeler, Participation and partnership in urban infrastructure management, vol. no. 19. Washington, DC, USA: World Bank, 1995, p. xi, 95 p.: 25 boxes, 3 fig.

J. T. Visscher, van der Werff, K., and Hague, N. L. S. N. V. - The, “Towards sustainable water supply : eight years of experience from Guinea-Bissau”, vol. no. 1-E. IRC, The Hague, The Netherlands, p. x, 60 p.: 7 fig., 15 tab., 1995.

I. N. U. N. I. C. E. F. - Ne Delhi, “WATSAN India 2000”. UNICEF, New Delhi, India, p. 48 p.: fig., ills., 1995.