1. Standard methods for the examination of water and wastewater;American Public Health Association,1975
2. Trace elements in soils;Aubert,1977
3. The mineral composition of crops with particular reference to the soils in which they were grown. A review and compilation;Beeson;Misc. Publs US Dept Agric.,1941
4. Trace elements in biochemistry;Bowen,1966
5. The geochemist's involvement with the pollution problem;Cannon,1971