Columbia subject headings:
Harvard subject headings:
Germany (East)--History--Congresses.
Germany (West)--History--Congresses.
International cooperation--History--20th century--Congresses.
Solidarity--Germany (East)--History--Congresses.
Solidarity--Germany (West)--History--Congresses.
Princeton subject headings:
Germany--Foreign relations--1945---Congresses.
International cooperation--History--20th century--Congresses.
Solidarity--Germany--History--20th century--Congresses.