Columbia subject headings:
Harvard subject headings:
Communication and technology--Europe--Congresses.
Europe--History--20th century--Study and teaching--Europe--Congresses.
History--Study and teaching--Europe.
Information technology--Europe--Congresses.
Princeton subject headings:
Communication and technology--Europe--Congresses.
Europe--History--20th century--Study and teaching--Europe--Congresses.
History--Study and teaching--Europe.
Information technology--Europe--Congresses.