Columbia subject headings:
Harvard subject headings:
Germany--Foreign relations--1871-1918.
Germany--Foreign relations--1933-1945.
World War, 1914-1918--Germany.
World War, 1939-1945--Germany.
Princeton subject headings:
Germany--Foreign relations--1871-1918.
Germany--Foreign relations--1933-1945.
World War, 1914-1918--Germany.
World War, 1939-1945--Germany.