1. Agronomic controls over the environmental cycling of trace elements;ALLAWAY;Advan. Agron,1968
2. Environmental Chemistry of the Elements;BOWEN,1979
3. Environmental geochemistry and health;BOWIE;Phil Trans. R. Soc. London,1979
4. Applied Soil Trace Elements;DAVIES,1980
5. Trace metals in soils, plants and animals;LISK;Advan. Agron,1972