1. Chemical Analysis of Ecological Materials;Allen,1974
2. Enzymic activity in a semi-gley soil under the flood-plain forest in South Moravia;Ambroz;Zentralblatt für Bacteriologie Parasitenkunde Infektionskrankheiten und Hygiene,1977
3. Organic phosphorus and phosphatase activity in cocoa soils in Ghana;Appiah;Ghana Journal of Agricultural Science,1975
4. Soil classification of the soil survey of England and Wales;Avery;Journal of Soil Science,1973
5. Effects of extended monoculture and crop rotation systems on microbiological activities in soil;Beck;Landwirtschaftliche Forschung,1974