Columbia subject headings:
Germany--Foreign relations--1990-
Germany--Foreign relations--20th century.
Germany--Politics and government--1990-
Harvard subject headings:
European Union countries--Foreign relations--Congresses.
Germany--Foreign relations--Congresses.
International relations--History--20th century--Congresses.
International relations--History--21st century--Congresses.
Schwarz, Hans-Peter, 1934-2017--Congresses.
Princeton subject headings:
Germany--Foreign relations--1945-