Columbia subject headings:
Germany--Foreign relations--Congresses.
Germany--History--Congresses.
Imperialism--Congresses.
Harvard subject headings:
Germany--Foreign relations--Africa--Congresses.
Germany--Foreign relations--China--Congresses.
Germany--Foreign relations--Congresses.
Imperialism--Congresses
Princeton subject headings:
Germany--Foreign relations--Congresses.
Germany--History--Congresses.
Imperialism--Congresses.