1. Trace elements in soils in England and Wales;Archer,1980
2. Sewage sludge as a source of cadmium in soil-plant systems;Baker;Environ. Hlth Perspectives,1979
3. Crops as indicators of the significance of contamination of soil by heavy metals;Davis,1980
4. Cadmium in agriculture with special reference to the utilisation of sewage sludge on land;Davis,1980
5. Lead in the environment and its significance to man;DOE,1974