Columbia subject headings:
Europe--Foreign relations--1871-1918.
Europe--Foreign relations--1918-1945.
Europe--Politics and government--1871-1918.
Europe--Politics and government--1918-1945.
Harvard subject headings:
Europe--Foreign relations--1871-1918.
Europe--Foreign relations--1918-1945.
Europe--Politics and government--1871-1918.
Europe--Politics and government--1918-1945.
Princeton subject headings:
Europe--Foreign relations--1871-1918.
Europe--Foreign relations--1918-1945.
Europe--Politics and government--1871-1918.
Europe--Politics and government--1918-1945.