From the minutes of the CERN council, dated 14 June 1960:
In a letter dated 22 April 1960, the president of the council asked delegates of the member states whether their governments would be prepared to confirm the attitude which they had adopted in 1956 regarding an application by Spain for membership of CERN.
Agreement has already been received from Austria, France, the German Federal Republic, Greece, the Netherlands, Sweden, the United Kingdom and Yugoslavia, and it is expected that by the time of the council session agreement will have been received from all the other member states. The only question to be settled is the amount of the special contribution Spain would have to pay.
Spain joined CERN on 1 January 1961.