Columbia subject headings:
Communist countries--Congresses.
National security--Europe, Eastern--Congresses.
Nationalism--Europe, Eastern--History--20th century--Congresses.
Harvard subject headings:
Communist countries--Congresses.
National security--Europe, Eastern--Congresses.
Nationalism--Europe, Eastern--History--20th century--Congresses.
Princeton subject headings:
Communist countries--Congresses.
National security--Europe, Eastern--Congresses.
Nationalism--Europe, Eastern--History--20th century--Congresses.