Columbia subject headings:
Harvard subject headings:
Communism--Germany (East)--History--Congresses.
Communism--Romania--History--20th century--Congresses.
Youth--Germany (East)--History--Congresses.
Youth--Romania--History--20th century--Congresses.
Princeton subject headings:
Communism--Germany (East)--History--Congresses.
Communism--Romania--History--20th century--Congresses.
Youth--Germany (East)--History--Congresses.
Youth--Romania--History--20th century--Congresses.