1. Crop Nutrition and Fertiliser Use;Archer,1988
2. Effects of Metals in Sludge-treated Soils on Crops;Carlton-Smith,1987
3. Council Directive of 12 June 1986 on the protection of the environment, and in particular of the soil, when sewage sludge is used in agriculture (86/278/EEC);CEC; Council of the European Communities;Official Journal of the European Communities,1986
4. Biological aspects of the disposal-utilization of sewage sludge on land;Coker,1983
5. Loss-on-ignition as an estimate of soil organic matter;Davies,1974