W. Stelzer, Tschaepe, H., Heier, H., Boettcher, I., and Ziegert, E.,
“Bacteria resistant to antibiotics in water and waste water and their public health implications”. World Health Organization Regional Office for Europe, Copenhagen, Denmark, p. 45 p.: fig., tab., 1989.
C. P. Straub,
Practical handbook of environmental control. Boca Raton, FL, USA: CRC Press, 1989, p. 537 p.: fig., tab.
PAHO -Washington, DC, US,
“Proceedings of the 18th Caribbean water engineers' conference : water and sanitation in the Caribbean beyond 1990 : Basseterre, St. Kitts, West Indies, 1-3 November 1989”. Pan American Health Organization (PAHO), Washington, DC, USA, p. 2 vol. (33 p. ; 158 p.): fig., tab., 1989.
G. P. M. Merinyo,
“A review of urban waste disposal systems in Tanzania”, presented at the 1989-01-01, Dar es Salaam, Tanzania, 1989, p. 15 p. + 4 p. ann.: tab.
USAID -Washington, DC, US and Ratmalana, L. K. National W.,
Wastewater treatment, Draft., vol. no. D7. Ratmalana, Sri Lanka: National Water Supply and Drainage Board, 1989, p. vi, 89 p.: fig., tab.