(1969). Guidelines and criteria for community water supplies in the developing countries. Rockland, MA: Consumer Protection and Environmental Health Service.
Παραπομπή Chicago StyleGuidelines and Criteria for Community Water Supplies in the Developing Countries. Rockland, MA: Consumer Protection and Environmental Health Service, 1969.
Παραπομπή MLAGuidelines and Criteria for Community Water Supplies in the Developing Countries. Rockland, MA: Consumer Protection and Environmental Health Service, 1969.
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