PAHO -Washington, DC, US,
Fenómeno “El Niño, 1997-1998”. Washington, DC, USA: Pan American Health Organization (PAHO), 2000, p. 294 p. : tab., graphics, map., photos.
M. Smith y Buttle, M.,
Out in the cold : emergency water supply and sanitation for cold regions. Loughborough, UK: Water, Engineering and Development Centre, Loughborough University of Technology, WEDC, 2000, p. 93 p. : fig., tabs.
F. Tonou,
«Projet d'assainissement : assainissement de la ville de Tchamba, Togo». Ecole Polytechnique Federale de Lausanne (EPFLA), Lausanne, Switzerland, p. 42 p., 2000.
I. A. Shiklomanov,
«World freshwater resources». UNESCO International Hydrological Programme, UNESCO-IHP, Paris, France, p. CD-R0M : 202 MB, 2000.