J. L. Ventura Rivas, J. Velasco, O., Roque, J. R., D. de la O., C., and Oviedo, F. A.,
“Manual de promocion de comunidades para sistemas de agua potable y letrinizacion en el medio rural”. El Salvador, Departamento de Acueductos Rurales, San Salvador, El Salvador, p. ca. 200 p., 1980.
L. Sidwell,
“Montserrat Water Authority accounting department handbook”. Pan American Health Organization, Division of Environmental Health Protection, Bridgetown, Barbados, p. 139 p.: charts, 1980.
C. Fernandez,
“Stores management : a training job manual”. Pan American Health Organization, Division of Environmental Health Protection, Bridgetown, Barbados, p. 83 p., 1980.
G. E. Nepomuceno,
“Village water program”. Philippines, Ministry of Local Governments and Community Development, Quezon City, The Philippines, p. 40 p.: fig., 1980.
V. Williams,
“Water treatment plant operation (rapid sand filter) : a training/job manual”. Pan American Health Organization, Division of Environmental Health Protection, Bridgetown, Barbados, p. 72 p.: fig., 1980.