Columbia subject headings:
Harvard subject headings:
Europe, Central--Economic conditions--20th century--Congresses.
Europe, Central--Politics and government--20th century--Congresses.
Europe, Eastern--Economic conditions--20th century--Congresses.
Europe, Eastern--Politics and government--20th century--Congresses.
European federation--History--20th century--Congresses.
Post-communism--Europe, Central--History--20th century--Congresses.
Post-communism--Europe, Eastern--History--20th century--Congresses.
Socialism--Europe, Central--History--20th century--Congresses.
Socialism--Europe, Eastern--History--20th century--Congresses.
Princeton subject headings:
Europe, Eastern--History--20th century--Congresses.
Europe, Eastern--Politics and government--20th century--Congresses.
European federation--History--20th century--Congresses.