1. Trace element levels in soils: effects of sewage sludge;Berrow;Inorganic Pollution and Agriculture. MAFF Reference Book,1980
2. COUNCIL FOR AGRICULTURAL SCIENCE AND TECHNOLOGY. 1980 Effects of sewage sludge on the cadmium and zinc content of crops
3. DEPARTMENT OF THE ENVIRONMENT. 1981 Report of the Sub-Committee on the Disposal of Sewage Sludge to Land
4. Metal-tolerant bacterial populations from natural and metalpolluted soils;Duxbury;Soil Biology and Biochemistry,1983
5. The effects of application of sewage sludge on microorganisms in soil;Eiland;Tidsskrift for Planteavl,1981