1. Organic carbon;Allison,1965
2. The soils and vegetation of areas affected by mining for metalliferous ores, with special reference to cadmium, lead and zinc;Alloway,1969
3. Cadmium, lead and calcium content, number and biomass, in earthworms (Lumbricidae) from sewage sludge treated soil;Andersen;Pedobiologia,1979
4. Lead, cadmium, copper and iron in earthworms from roadside sites;Ash;Environ. Pollut. (Ser. A),1980
5. Metals and terrestrial earthworms (Annelida: Ologochaeta);Beyer,1981