1. The Council of the European Union, Council Directive 1999/31/EC of 26 April 1999 on the landfill of waste, Official J. L 182 (1999) 1
2. The Council of the European Union, Council Directive 91/271/EEC of 21 May 1991 concerning urban waste water treatment, Official J. L 135 (1991) 40
3. An inventory of heavy metals inputs to agricultural soils in England and Wales
4. The Council of the European Union, Council Directive 91/676/EEC of 12 December 1991 concerning the protection of waters against pollution caused by nitrates from agricultural sources, Official J. L 375 (1991) 1
5. S.P. Theocharopoulos, A. Trikatsoula, D.A. Davidson, F. Tsouloucha, E. Vavoulidou, Land Information Systems – Developments for planning the sustainable use of land resources, EU Workshop, European Commission, Brussels, November 1996, Hanover, 1996, p. 373