Columbia subject headings:
Harvard subject headings:
Europe--Economic integration--Encyclopedias.
European Economic Community--Encyclopedias.
European Union--Encyclopedias.
European federation--Encyclopedias.
Princeton subject headings:
Encyclopedias.
Europe--Economic integration--Encyclopedias.
European Economic Community--Encyclopedias.
European Union--Encyclopedias.
European federation--Encyclopedias.