1)Baltic Soil Survey: Total concentrations of major and selected trace elements in arable soils from ten countries around the Baltic Sea. The Science of the Total Environment 257, (2-3), 155-170; 2)FOREGS Geochemical Baseline Mapping Programme 1998-2004 (http://www.gsf.fi/foregs/geochem/index.htm): Salminen, R. (ed.). 2005. Geochemical atlas of Europe. Part 1: Background information, methodology and maps. Espoo: Geological Survey of Finland. 525; p 3)EIONET data request 2003; Reimann, C., Siewers, U., Tarvainen, T., Bityukova, L., Eriksson, J., Gilucis, A., Gregorauskiene, V., Lukashev, V., Matinian, N.N. & Pasieczna, A. 2000.

Only randomly selected enrichment value dots shown for Austria, Bulgaria and Slovakia.