D. P. L. Brown and Hurtado, E.,
“Development of a behavior-based monitoring system for the health education component of the rural water and health project, CARE-Guatemala”, vol. no. 364. Water and Sanitation for Health Project (WASH), Arlington, VA, USA, p. 97 p.: fig., tab., ill., 1992.
J. Hukka,
“Environmental management in India : a baseline study”, vol. no. 55. Tampere University of Technology, Institute of Water and Environmental Engineeri, Tampere, Finland, p. 139 p.: 7 fig., 24 tab., 1992.