T. J. McGhee,
Abastecimiento de agua y alcantarillado. Bogota, Colombia: McGraw-Hill, 1999, p. 614 p. : tab., graphics, photos.
J. P. Canler, Perret, J. M., Duchene, P., y Cotteux, E.,
«Aide au diagnostic des stations d'épuration par l'observation microscopique des boues activés». CEMAGREF Editions, Cahors, France, p. 155 p. : fig., tabs., 1999.
T. Ningnoi,
«Arsenic removal from groundwater by conditioned zeolite», vol. no. 081. IHE (International Institute for Infrastructural, Hydraulic and Environmental Engineering), Delft, The Netherlands, p. 54 p. : fig., tab., 1999.
Ostertech -Phoenixville, PA, US, Highsmith Environmental Consultants -Atlanta, GA, US, Solmetex -Northborough, MA, US, y Group, I. Capital Co,
«Arsen:X tm Systems». Ostertech, Phoenixville, PA, USA, p. ca. 15 p. : tab., techn.drwngs, 1999.
T. K. Weldesemayat,
«Defluoridation of drinking water by conditioned zeolite», vol. no. 080. IHE (International Institute for Infrastructural, Hydraulic and Environmental Engineering), Delft, The Netherlands, p. vi, 37 p. + annexes (ca. 15 p.) : 25 fig., 5 tab., 1999.
R. Paramasivam, Hasan, M., Ansari, M., y Kelkar, P.,
«Drinking water supply through reverse osmosis desalination plants in Ramanathapuram district of Tamil Nadu, India»,
Water science and technology, pp. p. 77-84 : 1 fig., 4 tab., 1999.
J. B. Eweis, Ergas, S. J., Chang, D. P. Y., y Schoroeder, E. D.,
Principios de biorrecuperación : tratamiento para la descontaminación y regeneración de suelos y aguas subterráneas mediante procesos biológicos y físico-químicos
. Madrid, Spain: McGraw-Hill, 1999, p. 345 p. : tab., graphics, photos.
T. Okuda, Baes, A. U., Nishijima, W., y Okada, M.,
«Research note: improvement of extraction method of coagulation active components from Moringa oleifera seed»,
Water research, pp. p. 3373-3378 : 4 fig., 1 tab., 1999.
R. Shaw, Folkard, G. K., y Sutherland, J. P.,
«Technical brief no. 60 : water clarification using Moringa oleifera seed coagulant»,
Waterlines, an international journal of water, sanitation and waste, pp. p. 15-18 : ill., 1 fig., 1 tab., 1999.