P. H. Philippine City et IWSA -London, GB, International Water Association,
« 3rd Asia Pacific Regional Water Supply Conference and Exhibition, Nov. 15-19, 1981, PICC, Manila, Philippines : proceedings ». PWWA, Quezon City, The Philippines, p. 300 p. + photo souvenir album (56 p.), 1981.
PAHO -Washington, DC, US,
« Appraisal of the feasibility of a training system for technical personnel of water supply and sanitation institutions in Central America, Panama, and the Dominican Republic ». Pan American Health Organization (PAHO), Washington, DC, USA, p. ii, 77 p.: fig., tab., 1981.
M. Glaze,
« Aspects of well drilling : rural potable water project », vol. no. 4. Water and Sanitation for Health Project (WASH), Arlington, VA, USA, p. 15 p., 1981.
Z. Ministry o ZM,
« Bilharzia ». Zambia, Ministry of Health, Health Education Unit, Lusaka, Zambia, p. 14 p.: ill., 1981.
C. (State). D. US,
« Captured rainfall : small-scale water supply systems ». State of California, Department of Water Resources, Sacramento, CA, USA, p. viii, 56 p. : 14 fig., 2 tab., 1981.
N. P. Cheremisinoff, Cheremisinoff, P. N., et Tratter, R. B.,
Chemical and nonchemical disinfection. Ann Arbor, MI, USA: Ann Arbor Science, 1981, p. xi, 172 p.