Columbia subject headings:
Harvard subject headings:
Telecommunication--European Economic Community countries--Statistics--Periodicals.
Tourism--European Economic Community countries--Statistics--Periodicals.
Transportation--European Economic Community countries--Statistics--Periodicals.
Princeton subject headings:
Telecommunication--European Economic Community countries--Statistics--Periodicals.
Tourism--European Economic Community countries--Statistics--Periodicals.
Transportation--European Economic Community countries--Statistics--Periodicals.