Heli Perrett

Subjects

Sanitary engineering, Sanitation, International Drinking Water Supply and Sanitation Decade, 1981-1990, Communication, Communication in economic development, Communication in health education, Community development, Domestic Economic assistance, Economic development projects, Evaluation, Food, Food contamination, Food handling, Food industry and trade, Hygienic aspects of Water supply, Outhouses, Planning, Public opinion, Safety measures, Social aspects, Social aspects of Outhouses, Social aspects of Sanitary engineering, Social conditions, Water supply, Water-supply

Places

Developing countries