1. Heavy metals in soils;Alloway,1975
2. Mercury and As content of soils and plants in the area of an abandoned Hg mine at “El Terronal” (Mieres, Spain);Arias,1998
3. Environmental inorganic chemistry: properties; processes and estimation methods;Bodek,1988
4. Environmental chemistry of the elements;Bowen,1979
5. Biological methods of prospecting for minerals;Brooks,1983