Columbia subject headings:
Europe--Foreign relations--Germany.
Europe--Politics and government--1918-1945.
Germany--Foreign relations--Europe.
Rhineland (Germany)--History.
World War, 1939-1945--Causes.
Harvard subject headings:
Europe--Foreign relations--Germany.
Europe--Politics and government--1918-1945.
Germany--Foreign relations--Europe.
Rhineland (Germany)--History.
World War, 1939-1945--Causes.
Princeton subject headings:
Germany--History--1933-1945.
Rhine River Valley--History.