1. Trace elements in sewage sludges;Berrow;J. Sci. Fd Agric.,1972
2. Inhibition of urease activity in soils;Bremner;Soil Biol. Biochem.,1971
3. Determination and isotope-ratio analysis of different forms of nitrogen in soils—3. Exchangeable ammonium, nitrate, and nitrite by extraction-distillation methods;Bremner,1966
4. Crop and food chain effects of toxic elements in sludges and effluents;Chaney,1973
5. The properties of sludges;Dean,1973