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European Commission (10 November 2005). "1972". The History of the European Union. Archived from the original on 14 June 2006. Retrieved 18 January 2006.
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"La ofensiva europea" [The European Offensive]. ARTEHISTORIA (in Spanish). Junta de Castilla y León [Government of Castile and Leon]. Archived from the original on 11 January 2014. Retrieved 2 August 2013.