Biblio

C. Powell, Larrea, O., y Vargas, V., «Evaluations of water interventions in Bolivia», vol. no. 4. Environmental Health Project (EHP), Arlington, VA, USA, p. xiii, 100 p.: 2 fig., 1 map, 17 tab., 1994.

R. Hetes, Levy, B., Powell, C., Whiteford, L., y Brantly, E., «Environmental health assessment : an integrated methodology for rating environmental health problems», vol. no. 436. Environmental Health Project (EHP), Arlington, VA, USA, p. vii, 34 p.: 5 tab., 1993.