Columbia subject headings:
Germany--Foreign relations--1871-1918.
Germany--Foreign relations--1918-1933.
Germany--Foreign relations--1933-1945.
Harvard subject headings:
Germany--Foreign relations--1871-1918.
Germany--Foreign relations--1918-1933.
Germany--Foreign relations--1933-1945.
Princeton subject headings:
Germany--Foreign relations--1871-1918.
Germany--Foreign relations--1918-1933.
Germany--Foreign relations--1933-1945.