Social policy series
Commission of the European Communities , sold by European Community Information Service]
Commission des communautés européennes 1972 Social policy series no. 22
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Commission of the European Communities
Office for Official Publications of the European Communities 1970 Social policy series no. 21 , Studies
[Commission des communautés européennes] 1970 Social policy series no. 20
Communauté économique européenne 1966 Social policy series no. 14