Columbia subject headings:
Harvard subject headings:
European cooperation.
Portugal--Boundaries--Spain.
Portugal--Economic conditions--1974-
Portugal--Relations--Spain.
Spain--Boundaries--Portugal.
Spain--Economic conditions--1975-
Spain--Relations--Portugal.
Princeton subject headings:
Portugal--Economic conditions--1974-
Portugal--Relations--Spain.
Spain--Economic conditions--1975-.
Spain--Relations--Portugal.