Columbia subject headings:
Europe--Relations--Spain.
Spain--Politics and government--20th century.
Spain--Relations--Europe.
Harvard subject headings:
Europe--Foreign relations--Spain.
European Economic Community--Spain.
Spain--Foreign relations--Europe.
Spain--Politics and government--20th century.
Princeton subject headings:
Europe--Relations--Spain.
Spain--Politics and government--20th century.
Spain--Relations--Europe.