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- Statistical Office of the European Communities (8)
- Commission of the European Communities (1)
- Commission of the European Communities. Directorate-General for Energy (1)
- Descartes, René, 1596-1650 (1)
- European Commission (1)
- European Commission. Disrectorate-General for Energy (1)
- Hammacher, Klaus, 1930- (1)
- Office for Official Publications of the European Communities (1)