Biblio

L. F. Requena y de Quintanilla, E., «El Salvador : program for monitoring surface and groundwater in the watershed between the Barra de Santiago and El Impossible», vol. no. 425. Water and Sanitation for Health Project (WASH), Arlington, VA, USA, p. xiii, 50 p. + 9 appendices: 2 map, 3 tab., 20 photogr., 1993.

P. Roark, Rosensweig, F., Requena, L. F., Lord, W. B., Andrews, R. N., Brantly, E., y O'Toole, L. J., «Guidelines for improving wastewater and solid waste management», vol. no. 88. Water and Sanitation for Health Project (WASH), Arlington, VA, USA, p. xiii, 135 p.: 4 fig., 2 tab., 1993.

L. F. Requena y Myton, B. A., «Surface and groundwater contamination in selected watersheds in Southwestern El Salvador», vol. no. 354. Environmental Health Project (EHP), Arlington, VA, USA, p. xvii, 152 p.: 1 fig., 4 maps, photogr., 16 tables, 1991.

L. F. Requena y de la Parra, C., «Environmental assessment of the public services improvement project component III - water supply, sanitation and health : El Salvador», vol. no. 299. Water and Sanitation for Health Project (WASH), Arlington, VA, USA, p. xii, 97 p.: photogr., 1990.