Comparative studies of food and environmental contamination. - Food and Agriculture Organization of the United Nations; Proceedings of a symposium on Nuclear Techniques in Comparative Studies of Food and Environmental Contamination organized by the Food and Agriculture Organization of the United Nations, the Interantional Atomic Energy Agency, and the World Helath Organization, held in Otaniemi, Finland, 27-31 August 1973; International Atomic Energy Agency; World Health Organization (Vienna International Atomic Energy Agency, 1974)